Edmunds dealer partner, Bayway Leasing, is now offering transparent lease deals via these forums. Click here to see the latest vehicles!

Chevy Silverado and GMC Sierra Transmission Problems

1…1617192122…30

Comments

  • ceb66ceb66 Member Posts: 70
    edited June 2011
    mloecker,

    Haven't taken mine to another shop.

    I won't.

    GM builds em'. GM knows the issues. If they can't correct it, doubt anyone can.

    Plus, it's under warranty so you can't let anyone touch it other than a "qualified" GM Tech.

    I do trust their Techs. They know what's going on. I think the Dealer's hands are tied.
  • gmcustsvcgmcustsvc Member Posts: 4,252
    ceb66,
    There are many different district specilists, not just the ones for your region. I apologize but to resolve the concerns we work closly with the dealers. I would recommend following your agents recommendations so they can continue to try to resolve your concerns and frustrations.
    Christina
    GM Customer Service
  • gmcustsvcgmcustsvc Member Posts: 4,252
    beachedgm,
    Have they involved technical assistance? If they haven't I would ask them to. Please keep me updated on your situation.
    Christina
    GM Customer Service
  • el_hoppyel_hoppy Member Posts: 43
    Christina
    you said "I would recommend following your agents recommendations so they can continue to try to resolve your concerns and frustrations."

    does that include me being told by my dealer not to return to his store? after my 3rd visit for the same transmission problem the dealer told me they are done with me and my truck. I was asked never to return.

    thanks for nothing!

    I have 5K miles on my 2011 Silverado and I am still waiting for my dumb transmission to "learn" how to shift.
  • ceb66ceb66 Member Posts: 70
    edited June 2011
    At times, it's difficult to determine who's writing and who's replying!
  • ceb66ceb66 Member Posts: 70
    Christina,

    You wrote: "I would recommend following your agents recommendations."

    This if futile. My "agent" "recommended" I go BACK (again) to the Dealer THAT TOLD ME EVERYTHING IS NORMAL (severe clunking/banging is normal on a new car?).

    The underpaid, overworked customer service agent could have told me that. What's the use of a second tier "District Specialist"?

    And they're not "concerns and frustrations" as you put it. GM replaced A TORQUE CONVERTER four days after I took delivery of this thing. They're very valid complaints.

    Also, two GM techs I know in town (friends) told me the District Specialist for my area is a woman. It's a relatively small town. One of the Techs has worked for GM since 1989. When the DS contacted me it was a man that tried to tell me the tranny symptoms I'm having are due to the engine going into economy mode by dropping cylinders. OK, so when I step on the gas, the engine actually drops cyliders and causes the rear end to clunk. Hmmm. OK. Guess that makes sense.

    Can you understand why we're pulling our hair out?
  • chuck1chuck1 Member Posts: 1,405
    "This is widespread and you appear to want to downplay that. "

    It's not that widespread. If you look through this thread, it's very few people that are having problems. I looked back at the beginning of it. The one's who are (having issues) are quite upset and vocal(and I don't blame you guys) after spending 30Kplus.

    But based on the numbers SOLD and the number of complaints here and elsewhere it's not that widespread. But GM should step up and address your concerns. However, if it shifts OK and clunks once in a while, GM will not (or cannot fix it). I traded in an '05 - 4Runner and the transmission was smoother.

    I am a happy owner of a 2011 Silverado with the 5.3 and 6 speed tranny. Granted it only has about 1500 miles on it, I am not having any of the issues you guys are describing. My only complaint is mpg doesn't seem to be close to what the sticker says. It's a very quiet truck, smooth and with the chrome pkg. looks quite sharp.
  • ceb66ceb66 Member Posts: 70
    I'm glad you're a happy owner.
  • lstriplstrip Member Posts: 42
    that makes one of us!
  • chuck1chuck1 Member Posts: 1,405
    Yea, the other 30,000plus units sold in May - all are having problems.

    Do a google on 2011 Silverado transmission problems and a few pop up. Not many if you look at YTD sold.

    There is not even that many if you google the 2010. There are some issues, but this forum makes it sound like it is more wide spread than it actually is.

    Could be not that many miles have accumulated on the 2010s and 2011s. Or everybody else is happy.
  • ceb66ceb66 Member Posts: 70
    edited June 2011
    Hi lstrip,

    Even if this isn't widespread (it is), you, me and the rest of the folks here and on other sites have valid problems beyond the "idiosyncrasies" we're being told to tolerate.

    My torque converter was replaced at 400 miles because the thing allegedly disengaged while a Tech was driving it. It still "disengages" when I step on it (not hard either).

    Even if it was isolated, just you or just me, GM should fix the problem.

    If you haven't "adjusted" to your tranny since December (or vice-versa), I doubt I'll adjust to mine! Especially the thud at most speeds.

    I've had a Tech (friend) from an "outside" GM dealership tell me they're receiving "significant feedback" on the electronic 6 speed. That coupled with two other items is proof it's not isolated:

    1. The dealer response to all of us is verbatim; "It has to adjust/learn...” and "the electronic 6 speed takes some time getting used to", "operating as designed..." Someone in GM had to get that word out to ALL the dealers. They wouldn't do that if this was isolated and they weren't receiving "significant feedback."

    2. Check the location of the "Tranny problem" thread in the list of topics. It's been at the top for months.

    Doesn't make much sense for us to "Google" the truck if we're having problems beyond the "design parameters."

    It's akin to "my wheel fell off" and the response is "you're the only one, quit complaining!"

    Hang in there.
  • lstriplstrip Member Posts: 42
    you obviously are a gm employee. my 2010 has 12000 miles on it and still has this problem. gm cust service will not acknowledge this problem. their answer is "operating as designed".
    regardless of how widespread "you" think this problem is, it is being experienced by numerous owners. and we are all getting the same response. nothing.
  • beachedgmbeachedgm Member Posts: 3
    They did not. The rep told me there was nothing they could do until I made the time to take off from work and take it to my dealer again. He said that until I brought the truck in my case was closed. I explained to him that my truck is my office and if the dealer would give me a loaner so that I could still get to the jobsites I would be able to get it in. He said that it would be a dealers decision and the service rep at Jeff Gordon said no loaners!
  • chuck1chuck1 Member Posts: 1,405
    edited June 2011
    First off, I am not a GM employee. This power train IS NOT as smooth as my '05 Toyota 4Runner that I traded in with 91,000 miles on it. You will NEVER FIND a GM employee driving a Toyota.

    If your having "shifting problems" there may be issues. For you who are complaining about "clunking" ( and I know it doesn't clunk all the time) then you need either to get used to it or dump your truck. And I don't disagree that it shouldn't clunk at all, but it seems to be characteristic of this power train. So all of you with a "clunk" issue can continue to try to find an answer that isn't there, or move on.

    The Toyota Tundra may have bed bounce issues but the power train does not clunk. I hear there are some great incentives now. Or, buy the Dodge, it's a great truck, just sucks the gas with the Hemi. The Ford is a smooth rig, I test drove one.

    As far as the "shifting problems" being wide spread, if it is the owners are keeping it a big secret as Internet searches on issues DO NOT SHOW UP in big numbers.

    Good luck gentlemen.
  • ceb66ceb66 Member Posts: 70
    edited June 2011
    Hey lstrip,

    I'd give the "Happy Owners" in this thread an opportunity to take their own advise and "traditionally not respond" at this point.

    Those folks are having the "operating as designed" issues and willing to accept it while we have the "operating as designed issues" with our “units”, PLUS SOME!

    The following came from paragraph #3 at: http://www.gminsidenews.com/forums/f53/2010-silverado-numerous-drivetrain-compla- - - - - - ints-93871/

    It's a long message but it describes some of my problems:

    3-The transmission shifts very rough and 'jerky' when at low speeds. For instance, when I'm in a parking lot and it shifts up, it does so in a way that feels like it slams into gear. It'll lag for a split second between gears and then "hit" the next one. Also, in circumstances such as slowing for a light where you'll be turning, the truck lags in the middle of the turn and then also "slams" into gear coming out of the turn. For example, when I slow down to make a right hand turn at a light, if I have the green and therefore don't have to stop, once I get about halfway through the turn I start applying the accelerator but it doesn't respond. It lags in the turn. Then, once it does respond it will downshift firmly and slam into gear. As a former professional driver, I pride myself on being very smooth but its simply not possible to be smooth with the way this transmission is shifting at low speeds.

    I keep finding these comments.

    Let's keep using this site as an information exchange. Not a response to diversionary comments like a "Happy Owners."

    When I'm a "Happy Owner" with one of the many properly operating "Units" (weird), I'll post on the "Happy Owner's" thread instead of the transmission problem thread!
  • gmcustsvcgmcustsvc Member Posts: 4,252
    beachedgm,
    Can you please email me your complete contact information, VIN, and current mileage? I look forward to your response. Have a great weekend!
    Christina
    GM Customer Service
  • chuck1chuck1 Member Posts: 1,405
    "I keep finding these comments."

    I searched that very forum and couldn't find any comments (your link isn't working). Not saying your did not give correct info, I just couldn't find those comments.

    I am still not finding any bad transmission comments on the 2010s or 2011s in any great numbers on Internet searches.

    If you "keep finding these comments" (in great numbers) I would like to know your sources(s).
  • daviddgmctruckdaviddgmctruck Member Posts: 10
    I have a 2009 gmc crew 1500 4x4 with downshift problems. while slowing down between 4-3 3-2 gears my truck jumps when it downshifts. was told a while back were no codes. It feels like engine cuts out as it downshifts but that is not the case. I have purchased 20 new gmc trucks over past 25 years and never had a shift problem. With the jumping or pumping it makes downshifting it will without a dought be making wear isues as ujoints or gear slop . I am taking back in this week with 32000. this truck has done this since new, wish me luck.
  • excellentnurseexcellentnurse Member Posts: 12
    Mine was acting as if someone was tapping the rear end of the truck when I was at a stop. Mine would do what yours is doing occasionally, but seem to have more of a problem with the first thing I mentioned. GMC told me the same thing, they lie, they do not want people to realize that all their trucks for the last 7 years have had transmission problems. The people at the dealer are told by the higher ups what to say, they are all just trying to put us off until the powertran warranty runs out.
  • formulaccformulacc Member Posts: 3
  • formulaccformulacc Member Posts: 3
    ** yes I know this has come up in other threads but I would like to open a new thread to this issue specifically and hopefully compile some useful information **

    Can we please keep the vehicles relevant - 2007 and newer silverado and sierras with GM's transmission - 6l80e and 6l90e (not the allison).

    My vehicle is a 2011 silverado 2500 6.0L with the 6L90 tranny. currently 13,000 miles.

    Since new, this vehicle has had what I describe as a hesitation when accelerating - most noticeable just before down shifting. For example if I turn at a stop light and then re-accelerate, but not so hard as to downshift, the truck bucks and jerks for about 5 sec. or until the next shift. It is also noticeable when climbing a hill - as you roll on a little throttle the vehicle starts to buck and jerk all the way up the hill. Its not as noticeable if the truck down shifts, but it is still there a little.

    I was convinced that his was the engine hesitating, but after going around and around with 3 different dealers - one dealer finally drove the vehicle and recorded live data. He told me that they can see the torque converter locking and unlocking repeatedly. At first the dealer told me this was not normal but since there was no check engine codes (there actually was a throttle position sensor code but it was a long time ago so that was ignored) they would need to drive a similar vehicle. Weeks go by and they finally drive another truck and their attitude changed and I was hearing the exact words that we have seen on other posts "normal operation" "transmission learning" "you must be driving on that fine line".

    Here are a couple of things I find interesting:

    - The hesitation / jerking seems to get worse when the weather is hotter.
    - Since the dealer pointed me toward the torque converter, I have noticed other strange symptoms 1. every now and again it feels like it misses 2nd gear and revs or a second before coming back down (like it slips) 2. sometimes at low speeds around town I get a harsh clunk - like shifting a manual without pressing in the clutch (this only started recently).
    - the fact that there was a thottle position sensor code, because on other threads there seems to be some metion of this.

    I am supposed to be contacted by my GM regional rep within the next day. I would like to compile other similar cases - others that have been given the "run around" and possible fixes or not.

    thank you!
  • mloeckermloecker Member Posts: 26
    yep- mine does the same- I thought someone smashed into me the other day while parked at a stop sign; I looked behind me and nothing- GM has issues, good old GM- they sure are good at selling the lemons, but when it comes to fixing them for their defects- OH boy- we don't have any problems.... hahahah. Nice! just sayin.
  • casillacasilla Member Posts: 20
    The 4 speeds are just as bad as the 6 speeds. I have had a whine in my while in gear and was told by my dealer that it was a planetary gear noise and was a normal operating condition, that was on may 24 2011, The noise kept getting louder, so today I went to another dealer in a different town and they handed me a tsb from feb 2011 describing a torque converter whine problem in 2009 and 2010 4l60e trannies. I got blown off at the dealership where I purchased my truck! Great deal, glad I bought a GM!
  • chuck1919chuck1919 Member Posts: 176
    edited July 2011
    2007-2010 GMC Sierra (New Body Style) with Single-Piece Propshafts

    All Equipped with 4L60 Automatic Transmission (RPO M30) and 2WD

    Attention: This bulletin contains a procedure to clean/lubricate the slip yoke splines and replace the slip yoke, if necessary. Check the history on this vehicle. If the lubrication procedure has been performed previously, then continue on and replace the slip yoke.

    Condition:
    Some customers may comment that the vehicle has a bump feel or a clunk noise at a stop or on launch. Customers may also comment that the bump feel or clunk is noticed after the vehicle has come to a complete stop and that it feels as if the vehicle was bumped from behind.

    Cause:
    This condition may be caused by a slip/stick condition in the interface between the rear propshaft slip yoke and the transmission output shaft splines. Braking to a complete stop can force the propshaft slip yoke forward into the transmission while the vehicle rebounds slightly backward after stopping its momentum and create this condition.

    Correction:
    Note: A bump feel or noise may also be due to fuel movement in the fuel tank when not completely full. If the condition is eliminated after filling the fuel tank, the noise is isolated to the fuel movement in the tank. Please make no repair attempts, as this noise is considered an operating characteristic.

    Verify the customer's concern.

    Clean/Lubricate Slip Yoke Splines:

    Remove the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.
    Inspect the rear slip yoke splines on the drive shaft.
    Clean the slip yoke splines with brake cleaner or equivalent and a shop towel.
    Assure the yoke is free of rust or other foreign material.
    Lubricate the slip yoke spline with grease, P/N 19257121 (in Canada, 19257122), using a brush or swab to completely cover the entire spline with a light coating of grease.
    Reinstall the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.
    Road test the vehicle and verify that the noise is gone.
    Note: Do Not replace the slip yoke unless the cleaning and lubrication procedure is ineffective.

    If the vehicle has a repeat concern after lubricating the slip yoke splines, it may be necessary to replace the propeller shaft slip yoke with a new nickel-plated slip yoke.
    Replace the Propeller Shaft Slip Yoke

    Remove the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.
    Important: Some U-joints are fastened with nylon injection clips. If so, Do Not reuse the U-joint. Replace with GM P/N 12479126 U-Joint kit.

    Replace the propeller shaft slip yoke with a new nickel-plated slip yoke. Refer to Propeller Shaft Slip Yoke Replacement in SI.
    Install the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.

    Parts Information:

    LUBRICANT - Part#19257121 (in Canada, use 19257122)

    SLIP YOKE - Part#19121437 - 2007 & 2008 - Utilities / Tahoe / Yukon and Avalanche

    SLIP YOKE - Part#20877209 - 2009 - Tahoe / Yukon & 2007-2010 Pickups

    JOINT KIT,PROP SHF UNIVERSAL - Part#12479126 (in Canada, use 10952423) Replace only if fastened w/nylon injection

    --------------------
  • scoobydoo9scoobydoo9 Member Posts: 1
    I have a 2000 silverado automatic that has lost OD and first gear. Oh, and it will not shift automatically. I can start out in 2nd, shift into 3rd and reverse works. It's 4 wheel drive, does the same in 2hi, 4 hi and 4 lo. I had 3 shops tell me it's the planetary gears,,, same old story with every tranny,,,,, had 1 shop tell me it could be a solenoid valve. Any Ideas? It has 225,000 on the original tranny, and has been acting like this for over 30,000 miles.
  • chuck1chuck1 Member Posts: 1,405
    If 3 shops told you the same thing, it would appear that is the problem. At 225,000 miles, what do you feel the functional life of the transmission should be?
  • lidarules1lidarules1 Member Posts: 6
    formulacc- I just read your post, and can totally relate to the problems you are having. I have a 2011 Silverado 1500 with a 6.2 and a 6 speed transmission. I have experienced the same tranny problems as you. In addition to those problems, when I start my truck for the first time in the morning it runs rough or chugs for about 5 or 10 seconds, until it finally idles down. The truck will also show that it is discharging sometimes when i'm driving, the volt gauge goes down to about 10 volts. These problems started at 1000 miles and the truck now has 3500 miles on it, and the problems seem to be getting worse. I have been to the dealer once so far, and they told me that I am probably not used to the 6 speed transmission, and they couldn't find the other issues . I'm not quite sure what to do next. If you could, please post what you find out from the GM rep. If I find out anything new, I will do the same. Thank You.
  • jlee55jlee55 Member Posts: 2
    My '97 Silverado automatic transmission shifts hard from first to second when its been running in heavy stop and go traffic or an hour of highway driving. This is the third occurance since I've had it, the first being new and still under warranty. It has been rebuilt twice.

    The change feels like you've just been rear-ended and only happens on the first gear change from dead stop.
  • jlee55jlee55 Member Posts: 2
  • larrykochlarrykoch Member Posts: 7
    FINALLY!!! With the help of GM customer service I was able to get the service mgr at my local Chevy dealer to take a personal interest in my transmission problem. Because I was unable to reproduce the problem when their transmission tech rode with me, I left the truck with him for a week and told him to drive it everywhere he went. When I returned from vacation he told me that he experienced the problem I had described. HE ALSO TOLD ME HE HAS A NEW 2011 OF HIS OWN AND HE HAS EXPERIENCED THE SAME PROBLEM. He told me GM has no reports of such a problem but he filed a case report and has a case number.

    What needs to happen now is for anyone experiencing this problem to lean on their service mgr and encourage them to file a report and get a case number. It's all about the numbers. If they have questions the can call my service manager, Jeff Webb, at Randy Reed Chevrolet, 816-236-5450.
  • kananskanans Member Posts: 1
    edited August 2011
    I have the same issues. My company finally bought me a new truck instead of letting me inherit the next oldest truck. They got me a 2011 GMC Sierra. I am a car guy, ex mechanic. It has 10K miles on it now. From day one, at stoplights I have had to look in the mirror weekly to see if I got rear ended, nope, its the **** tranny. And it always seems to hesitate excessively when letting of the gas and then hitting it. It also hesitates when I need to pull out onto a road from a dead stop. I lived with it because hey, I didn't pay for this truck my company did. I average about 100 miles a day between customers. But this morning I got a green left turn arrow so proceeded into the intersection. Halfway through I notice a typical zoned out driver to my right blew the light and I had no choice but to put it to the floor so the commuter wouldn't slam into me. Well... my high quality GM pickup decided that was a good time to exaggerate the transmission hesitation. When I put it to the floor there was a SOLID 3 COUNT before it decided what gear the slushbox tranny needed. It was annoying at first, but now its dangerous. I have never trusted american automatics, so sad that manuals are on their way out. My personal car is a manual and I will never buy an auto unless I have no choice. GM please fix this, it is a real issue! I was so excited that my boss sprung and spent the extra cash to get me a V8 4wd but sometimes I wish I had my 99 chevy silverado 2wd underpowered V6 company truck back. At least the tranny knew how to shift!!!
  • obyoneobyone Member Posts: 7,841
    sometimes I wish I had my 99 chevy silverado 2wd underpowered V6 company truck back. At least the tranny knew how to shift!!!

    So you're saying you would rather have the old 4L-60e vs. the new 6L-60e. The 4L-60e had it's share of problems including early torque converter lockup at around 39 mph. Perhaps a stall converter would help you out cause unless you're connected I wouldn't hold my breath on getting help on that 6L-60e.
  • chuck1chuck1 Member Posts: 1,405
    edited July 2011
    "I have never trusted american automatics, so sad that manuals are on their way out. My personal car is a manual and I will never buy an auto unless I have no choice."

    You will NEVER BE HAPPY with the 6 speed if your personal car is a manual.

    Next time your online, check out the complaints with the new transmission in the new Ford Focus, many complaints there too. In automobile manufacturer's quest to wring out every mile-per-gallon possible, they are making dual "dry clutch" automatic transmissions and doing all sort of exotic things you are probably not up on, unless you have been in a automotive classroom recently.

    The 6 speed in the GMC trucks is not a smooth power train, but if you do research on the web they are not trouble prone as some on this board would have you believe.
  • chuck1919chuck1919 Member Posts: 176
    edited July 2011
    Full descriptions of new or changed features

    New application:
    The Hydra-Matic 6L80 six-speed automatic transmission is the only transmission offered in the “New” Chevrolet Camaro SS when mated to the “L99” 6.2L V-8 VVT (L99) which is equipped with Variable Valve Timing ( VVT ), and Active Fuel Management ( AFM ). The 6L80 ( MYC ) is also a 2010 offering for the Chevrolet Corvette. Additionally the six-speed transmission is mated up with our strong family of Vortec engines in many of our world class GM trucks which include, Chevrolet Avalanche, Silverado, Suburban, Tahoe, GMC Sierra, Yukon, Yukon XL and Denali series, Cadillac Escalade, ESV, and EXT.

    Modular design for application flexibility:
    Because of the modular design of the Hydra-Matic 6L80 six-speed automatic transmission, there are different bell housings and different extensions that adapt the transmission to the front-mounted car and truck applications that can be configured with rear- and four-wheel-drive. The unique compound gearset in combination with a conventional simple gearset on the output carrier of the transmission allows both the durability necessary for the torque output of the V8 truck engines, as well as a flexible selection of gear ratios with a wide ratio spread.

    Overview:
    The Hydra-Matic 6L80 is six-speed automatic transmission for rear-drive cars, designed with modular flexibility and compatibility with advanced electronic controls. It was introduced for the 2006 Model Year Cadillac STS-V high-performance rear-drive sedan, and the XLR-V and Chevrolet Corvette two-seat sport coupes and convertibles. For 2007 model year, the Hydra-Matic 6L80 was added to the new Cadillac and GMC full-size SUVs and GMC Sierra Denali Pickup. The aluminum case for all these applications is identical, however, the bell housing for each application is unique because of the engine & driveline interfaces.

    All applications feature adaptive shift controls. Several additional features such as grade braking, Performance Algorithm Shifting, and Driver Shift Control are available on some of the applications. Performance Algorithm Shifting (PAS), which detects when the vehicles are being driven in a spirited fashion and remains in its current gear ratio even when the driver lifts a foot off the accelerator pedal. PAS monitors how assertively the driver is using engine output to determine at what engine speed to upshift or downshift. Driver Shift Control, available in the Corvette, STSs and XLRs allows the driver to shift the transmission like a clutchless manual gearbox. Electronic safeguards prevent over-revving should the wrong gear position be accidentally selected.

    A wide overall ratio spread of 6.04:1 allows a "steep" first gear, as well as very "tall" overdrive top gear for low-rpm highway cruising. Acceleration is maximized, as is fuel economy. Engine noise is also lower during cruising. Both fifth and sixth gears are "overdrive" gears, for example.

    Gear changes from second to sixth gears are accomplished with clutch-to-clutch control, where an oncoming clutch is engaged and an "offgoing" clutch is released in a precise manner to achieve the ratio change. The first-to-second upshift, however, is a freewheeling action, where the second gear clutch engages while the first gear one-way clutch spins freely. This allows a greater degree of smoothness at lower vehicle speeds. The clutch-to-clutch shifting and single freewheeler allows significant reductions in packaging requirements and, as a result, the new six-speed is nearly identical in size to the four-speed transmission it replaces.

    Advances in transmission control modules allow the modules to exist reliably inside the transmission, where temperatures remain fairly constant compared to a body-mounted module. The transmission and module are assembled together, so no additional steps are necessary during vehicle assembly.

    The 32-bit transmission control module (TCM) monitors transmission performance and compensates for normal wear in components such as clutch plates, so transmission performance remains consistent for the life of the transmission. The control module also "tests" the components of the transmission following assembly to optimize the interaction of the components. The module is compatible with future global applications.

    DEXRON VI premium fluid validated to improve durability and shift stability
    A new transmission fluid, DEXRON VI, was developed to have a more consistent viscosity profile; a more consistent shift performance in extreme conditions; and less degradation over time. Internal GM tests have demonstrated DEXRON VI delivers more than twice the durability and stability in friction tests compared to existing fluids. The DEXRON VI fluid was designed specifically and validated for the new family of GM six-speed automatic transmissions.

    While the basic aluminum housing for 6L80 transmissions can remain identical for a wide variety of applications, including front- and rear-mounting, car and truck applications, and rear- or four-wheel-drive applications, the case extensions and bell housings can be modified for nearly any longitudinal drivetrain vehicle. The modular concept of the new Hydra-Matic 6L80 six-speed automatic centers on the desire for common components and manufacturing tooling for four different size variants of the new 6-speed family. The main case uses three main components, and those components are the same for all variants of the transmission. For the first applications of the new transmission, the 6L80-E contains three gearsets, a conventional input planetary gearset with four pinion gears. There is one compound output gearset and one simple output gearset. The compound output gearset uses three sets of pinion gear pairs, with one set of pinions meshing with the sun gear and the other set with the ring gear. This arrangement allows for optimal ratio steps with a 6.04 overall ratio spread.

    There are two torque converter sizes, 258mm and 300mm. The 258mm applications use a twin-plate torque converter lockup clutch, while the 300mm applications use a single-plate torque converter lock-up clutch. Both types of clutches make use of GM's proprietary electronic controlled capacity clutch (ECCC) technology, which uses a small, regulated amount of slip to dampen out engine pulses. This creates a smoother running drivetrain, especially during shift events.

    Low maintenance:
    For severe use, DEXRON VI fluid changes are the only maintenance recommended. For normal use there is no fluid change scheduled.

    The Hydra-Matic 6L80 is produced in Ypsilanti, Michigan, Toledo, Ohio and Silao, MX

    Bottom line-we are all "feeling different things" because the transmission are using different methods of switching gears than we are used too. The car companies want to stop the energy waste in the transmissions. Not saying this is good or bad on how they behave. But it you own one, accept this technology or as I stat
  • lstriplstrip Member Posts: 42
    Chuck
    Your constant defense of this transmission is getting old.
    There is enough documentation to prove
    it is a flawed design.
    It is obvious that your job is to downplay
    the negative press.
    For those of us that are trying to get this issue
    resolved, we ask that you go cash your GM paycheck
    and move on.
    Larry
  • obyoneobyone Member Posts: 7,841
    Who did the last rebuild as they usually come with a 12k warranty?
  • chuck1chuck1 Member Posts: 1,405
    There is enough documentation to prove
    it is a flawed design.

    WHERE?
    The following were sales of the trucks in June-

    Silverado - 32,496
    Sierra -14,558

    Where are all the unhappy owners with the design flaw?

    Just asking?
  • excellentnurseexcellentnurse Member Posts: 12
    Jeff Gordon Cheverolet
  • lidarules1lidarules1 Member Posts: 6
    Chuck - I happen to be one of those non existent unhappy owners. Whether it's a flawed design or not, there is definitely something wrong with some of these transmissions and GM needs to take care of these problems under the drive train warranty. Instead we are being told by GM mechanics and service managers that what is going on with these trucks is normal. I would be happy to have GM buy back my truck, and maybe they can sell it to someone else who would like to have their transmission learn how they drive. When you spend close to $40,000 on a truck, the least it should be is reliable. It is sad when i have to be embarassed to have anyone ride in my brand new truck, because it runs like junk!
  • lstriplstrip Member Posts: 42
    Sales numbers have nothing to do with
    this problem. Many of us are previous
    or current owners of GM products.
    It was after purchase that most have realized
    the issues with this transmission.
    Again, enough with the GM propaganda.
    Larry
  • obyoneobyone Member Posts: 7,841
    I would be happy to have GM buy back my truck, and maybe they can sell it to someone else who would like to have their transmission learn how they drive.

    Have you investigated what your state requires to qualify for it's lemon law? Have you filed complaints with the BBB online against your dealership AND GM? Consulted with a lemon law attorney? GM will not buyback anything unless they are forced to. Anything else is wishful thinking.
  • ceb66ceb66 Member Posts: 70
    Larry,

    You got it! 45 year old Owner of six (6) former GMs. Never a complaint.

    Then this thing. Very disappointing.

    Doesn't make sense. The complaints are identical; clunking/banging/rough ride during AFM operation etc.

    The response by GM is too similar: "operating as designed/intended, electronic transmission has to get used to your driving habits..." C'mon?

    The "happy owners" don't get it. We're not checking sites like this because we have nothing better to do!

    As said before, the "happy owners" need to go to the "happy owners" site and talk about "units" sold.

    If I could "undo" this whole thing, GM would have their "unit" back.

    CEB66
  • chuck1chuck1 Member Posts: 1,405
    "Clunking banging transmission 2010 Silverado" (or any variation thereof) turns up less than one page on a google search.
    F.Y.I.
  • gatorusa68gatorusa68 Member Posts: 5
    sorry it took me soooo long to find this form. i didnt know in 2007 they had the 6 speed!!! i though or was told 6 speeds came out in late 2009. anyway how do we start a class action law suit. 2008 gmc sierra slt that looks like a Denali 3 transmissions 5 reflash 2 rearend carriers 1 whole new rearend new ecm and tcm 10 or so splin lubes new splin more lube all the door lock motors replaced ac head unit and lashing from locking torq like there is no tommorow GM DEALERS THIS IS ALL NORMAL give me a brake
  • gatorusa68gatorusa68 Member Posts: 5
    i did learn my service mgt but again as all have said GM says this is normal and what a coincidence my service mgt has a truck and has the same problem come on. the trick here is gm has told them what to say so after 5 years or 100,000 miles they are in the clear major recall is needed and to all you gm service people stop jerking us around
  • tx_architecttx_architect Member Posts: 3
    Today I made what I considered to be a great deal on a new 2011 Silverado 1500 Texas Edition with the 5.3L engine and 6 speed tranny, but I am going to have to pass on it now. No way I'm going to risk it after reading all these complaints. (I have a nice GM Card rebate I need to use, but I'm having a hard time finding a GM product in my price range that I want to buy.) Thanks for heads-up on tranny, all you unhappy owners! I'll keep looking for something else- maybe Traverse or Lacrosse, but I would have enjoyed a good truck more.
  • chuck1chuck1 Member Posts: 1,405
    Really curious how tx_architect signed up for Edmunds just to make this one post!

    HM??
  • lstriplstrip Member Posts: 42
    Really curious why chuck1 continues to post
    here.
    Oh thats right, he's the gm employee
    trying make it seem like just a few disgruntled
    owners complaining.
    Not working chuuuck.
    Larry
  • battlefield11battlefield11 Member Posts: 3
    My transmission has a hard shift between 1st and 2nd gear, at about 15 to 20 mph, when you let off of the gas and then press the gas pedal again. I took it to the dealership and they said "it works normal". I just don't want any other problems to occur because of the hard shift. Why is it every time a dealer has to do warranty work they say it works fine. Also two days ago the whole dashboard went out, even the gear shift . I took it in this morning and they said the computer showed no problems. I have a 2010 silverado crew cab with the 5.7 and 20,000 miles. I just would like to know the actions needed to get my vehicle fixed, I don't want to have this problem and get cared thousands of dollars to get it fixed after the warranty is up.
  • tx_architecttx_architect Member Posts: 3
    I signed up to make my initial post because I am grateful to the many unhappy owners who shared their complaints with the online community and kept me from buying a potential lemon. If you are wondering why I never posted before, it's because I haven't bought a car since 2004. I proudly own a 2004 Buick LeSabre Custom and a 2000 Buick Regal, bought new after reading positive reviews on the internet. My last new car before that was a 1986 Camaro Z28, which I loved and drove for 14 1/2 years. I need to add a 3rd car because my son will need one for college, and I will give him the Regal. I research all my major purchases nowadays, but this is my first experience with the user comment section of Edmunds.
    By the way, I wanted to buy an Impala LT, but found the seats to be too hard, the interior too plain, and the rear middle headrest a visibility hazard. Now I will need to figure out if GM even makes a dependable, comfortable car that I fit in and I can afford- it's seems to be much harder than before.
Sign In or Register to comment.

Helpful Tools

Most popular vehicles