Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Chevy Silverado and GMC Sierra Transmission Problems



  • ceb66ceb66 Posts: 70

    My clunk is actually a slip then "slam".

    I've spoken with the dealer, a GM customer service rep and more than one "District Specialist" over the past four months.

    If you go that route, be prepared. It's an orchestrated, well-versed run-a-round!

    Also, an attorney advised me to write to the address in the back of what my dealer calls "my little owner's book" and ask for some relief. I haven't tried that.
  • chuck1chuck1 Posts: 1,405
    even asked my gm service manager if the AFM could be disabled and then
    let me drive for about a week to see if that was the problem.

    Switch your truck to manual mode, move the gear selector to 5th, the AFM will never kick in.
  • mloeckermloecker Posts: 26
    I have switched mine to tow haul in the city and the clunking, etc and all of the associated sounds that acompany it seem to go away. I just chalk this up to a lemon design and learned another lesson. never buy GM again and I make sure and tell everyone about it. I get my fair share of paybacks to GM in a month. LMAO-
  • lstriplstrip Posts: 42
    I have done this and the truck/transmission never has the problems.
    But, i should not have to operate this way to avoid the transmission
  • herm33herm33 Posts: 2
    Yes I have brought it into the dealership and I was told "all the 6 speeds work this way...its trying to find its gear".

    I'll try slipping it into manual and/or tow/haul mode.
  • chuck1919chuck1919 Posts: 176
    "I just chalk this up to a lemon design"

    I believe a "lemon design" would be a faulty transmission that fails prematurely or doesn't work at all. This transmission does shift and functions and shifts thorough the gears.

    It does - at times clunk.
  • ceb66ceb66 Posts: 70

    I recommended (to lstrip) trying manual mode only as a diagnosis, not as a solution. (he already tried that anyway!).

    I use manual 5th on long trips, however, I'm continuing to tell GM I want the AFM growl/lag/bang and other issues addressed with something more than "it's operating as designed." The dealer "sold" me on the 6 speed. I didn't pay for a 5 speed manual.

    This is not an exaggeration; during a 25 minute trip on a level highway, my truck will move between 4 and 8 cylinders close to 60 times. You can feel the growl, lag, subtle bump every time. It's annoying.
  • ceb66ceb66 Posts: 70

    In addition to the AFM, transmission issues (one of which is dangerous) and banging noises; my truck's A/C has started to cut in and out!

    My truck is not well-built either.
  • mloeckermloecker Posts: 26
    yu should ask ole GM Chuck here on the forum; he will have a politically correct answer for your a/c issue. It works don't it? They all cut in and out at times.... LOL Really?!
  • chuck1919chuck1919 Posts: 176
    It will switch to 4cyl. mode anytime you are at 6% or less throttle. The length of trip doesn't matter.

    When my truck switches to 4cyl. mode it's smooth and seamless.
  • I have a new 2011 gmc and am / was having the same problem. It slamed into gear and had a very hard time down shifting. To the point that today while going 40 I had to stop quick and did not. As I tried to stop the trans would not down shift and when it did and I swevered the truck lunged forward causing me crash. Has anyone else had this happen?
  • chuck1chuck1 Posts: 1,405
    So - the transmission did not downshift? And after it downshifted the truck lunged forward? Did you put your foot on the brakes? Did the ABS act correctly? What were the RPMs of the motor at this point? You had a "runaway truck?" What did you hit?

    Where did this happen?

    Please tell us more details.
  • gmcustsvcgmcustsvc Posts: 4,251
    Can you please email me with your complete contact information, VIN, current mileage, and involved dealer? I apologize for your frustrations and concerns. I look forward to your reply. Have a great weekend.
    GM Customer Service
  • Christina @ GM customer service is only gonna give you lip service, and not the kind you'd like. GM is ripping off their customer base and they don't care. They got their bailout... i'm going to purchase Ford next go around..F GM!

    I have a continual problem with flexplate failure, and GM claims 'poor maintenance'. If I'm supposed to drop the tranny at every oil change just to inspect the flexplate, put it in the damn owners manual!
  • The mechanic told me GM changed part #'s on flexplates...something was wrong from the get go. I'm a quality control inspector for aerospace components, and you don't change part #'s unless there is an engineering change...ISO 9001
  • after my 4th visit to my original sales dealership with the same transmission complaint , the service manager told me never to return.
    I am not kidding.
    during a visit to another dealership for an oil change I mentioned the transmission clunk to the service manager and he offered to replace the drive shaft yolk. he said he is aware of the problem and didn't try and tell me "its operating normal"
    its a lot better, not 100% but better.

    BTW, I have been in contact with GM customer service and they are absolutely NO HELP.

    3 more years of payments and when its paid off I am going to trade it in and buy a Ford or Dodge.
    you lost me as a customer GM.
  • How is the part replaced different than what came with the truck? On a scale from 1 to 10 -How much better is it?

    Also, one assumes that if your going to keep the truck for another three years it must be reliable and take you where you want to go?
  • you are unbelievable chuck.
    satisfaction with a product and the ability to "take you where you want to go" are vastly different. i can drive my old 2002 mazda if i just want to go somewhere.
    why do you insist on constantly trying to defend gm when we are all discussing valid concerns and issues with our trucks.
    why don't you try offering a little assistance rather than try to mute the discussion.
  • chuck1chuck1 Posts: 1,405
    edited September 2011
    I question how big a problem is when you take it to the dealer, the dealer fixes a part(and it performs better), and then someones says they are going to keep the vehicle for an extended amount of time.

    Mine clunks (occasionally as well). The power train is not refined as it should be. But the truck is also $4,000.00 to $5,000.00 less than the Ford. And my '2011 5.3 performed great in 116 degree heat and got 20mpg on a recent 900 mile road trip.

    Chevrolet and GMC sold over 50,000 trucks in August - good for them.
    Outsold the F-series by a few units.

    Also, I am ASKING what makes the replacement yolk DIFFERENT than what came with the truck. This I am asking for my own benefit as well as the benefit of others.
  • yah... Larry----- Chuck needs to crawl back under his rock- he is too out numbered here, besides; if all of us on this forum were happy with the damn GM pickups, we'd be doing more productive things I am sure. I am pretty sure I did not spend 40 THOUSAND DOLLARS to listen to ANY kind of clunks in my 2010 Silverado- Lesson learned fo me. As long as it goes forward when placed in D and reverse when placed in R, I am happy I guess because GM will never admit to any problems unless lives are lost due to quality issues-- take for example Toyota. Just sayin.
  • chuck1chuck1 Posts: 1,405
    edited September 2011
    It's approx. 13 owners to 1. They sold 50,000 trucks in August-clunk included.
  • ceb66ceb66 Posts: 70
    el hoppy,

    I haven't, and don't plan to make any (personal) derogatory remarks towards the dealer that sold me the truck or against GM. The service guy's hands are tied by GM management who in turn put pressure on the dealer through the District Specialist (DS). I sympathize with your frustration with the GM sales people and the customer service people. I've had the same experience.

    Been driving for almost 30 years. Had many GM "units" during that time. Didn't complain about one of them.

    The fact is, at 45 years old, I get disgusted and I’m insulted (like you) when the dealer's management staff and the District Specialist use identical verbiage/nomenclature; "operating as intended." OK, when the truck pulls right and the transmission slips “it’s operating as intended”? Yup, according to the DS it is. When my torque converter is replaced less than one week after delivery “it’s operating as intended”? Yup. When it makes a metallic slam “it’s operating as intended”? Yup…

    All these years of driving and I didn't realize my previous cars and trucks weren't operating as intended. They were supposed to slam (not clunk )/slip/pull right/growl in and out of 8-to-4 cylinder mode and continuously cycle the A/C on and off! I didn't know what I was missing.

    I should have listened to this site (Edmunds). They list the Silverado/Sierra as the number 4 consumer choice for trucks behind the Ford Ranger!

    Keep in mind this is one site. There are many more. The Escalade, Silverado and Avalanche owners are having similar issues.

    I’m very disappointed in the lack of quality, however, I can’t afford the 10% to 15% depreciation I’d have to eat if I traded this truck.

    Let's continue to try to get these issues resolved.
  • Chuck---- Ole Chucky... where are you to comment on this guy's statement.... it seems before GM will fix any "faulty" equipment they mfg- 100% of the vehicles they sell must incure issues.... I work for a mfg that had some issues with their whole house air filtration systems and the had less than 1 tenth of 1 percent failure and they said... ( 1 ) unit is more than we will stand for with issues and recalled everyone and fixed the darn things.... GM needs them all to fail or experience issues before things will change- F GM is right- they are a BS company... There Chucky--- let's see your comments- speak up. maybe you need to go to the Ford forums and kick em in the balls like u do us.
  • chuck1chuck1 Posts: 1,405
    edited September 2011
    "in and out of 8-to-4"

    The truck is designed to do this. It switches in to 4 cylinder mode anytime the throttle is 6% or less. It doesn't matter if you make a 1/4 mile trip to the corner store, a one mile trip, or a thousand mile trip.

    It sounds like if you didn't like this feature-you shouldn't have purchased the truck. However, it is the one feature you can basically turn off by putting the car in manual mode and selecting "5th".

    "clunk )/slip/pull right/growl" How often does the truck do this? Currently, how many miles are on the truck?
  • I have no idea how the 2nd yolk is different from the 1st.
    ask GM.

    so what your saying chuck is, GM's new motto should be,

    " it will clunk, but you'll save a buck "
  • chuck1chuck1 Posts: 1,405
    If you could find out how the second part is different it might will out some others on this board.
  • Once again Chuck, why do you feel compelled to defend gm.
    Every problem someone describes, you try to minimize their issue.
    I can say I have no problem with the AFM 4 to 8 cyl transition and back.
    I thought this was my problem but, I have monitored this for thousands of miles. It is not noticeable at all on my truck.
    My issue is definitely the transmission. My understanding is that an aftermarket flash can provide better "feel" for this transmission.
    Why is GM not willing to provide this fix for its customers?
  • ceb66ceb66 Posts: 70
    Hi Larry,

    From talking with GM, I doubt they'll "provide" anything to it's customers after the sale. I was sold a bill-of-goods.

    I can't even get my NEW truck aligned properly. I've been told everything from I may have a bad tire (Generals, Wow!) to it was treated improperly during shipping.

    In addition to the AFM and other issues, I've got transmison issues also. They seem to be related. My tranny issues are amplified by the AFM as it switches back and forth between cylinders. Especially 4 to 8. It lags, growls, lunges then intermitantly "bangs" as it "jumps" to 8 cylinders. It's really annoying.

    According to a friend that works for GM, they're well aware of the transmission and AFM issues.

    Does your truck knock/tap when you firt start it in the morning? My Ford didn't do that until it had alot of miles on it.
  • chuck1chuck1 Posts: 1,405
    My tranny issues are amplified by the AFM as it switches back and forth between cylinders.

    How does the tranny issues get amplified when the transmission doesn't downshift when the AFM comes on? Doesn't the AFM kick in with less throttle? If your going down the road- the AFM will kick in and depending on terrain the transmission will feel no need to shift. Then, at this point how does the truck behave?
  • chuck1chuck1 Posts: 1,405
    edited September 2011
    It amazes me how someone like "hotrodjim" (see [post 987) can say his truck made him have an accident. Yet, when you start asking questions the answers are not forth coming.

    It amazes me how others post that the AFM switches 50 to 60 times during a trip. GUESS WHAT? If the conditions are such it's what it was designed to do!!

    If your going to have a gripe fest, at least gripe about things that are legitimate, like a power train that may not be refined as we like it. Not unreliable mind you...just maybe not as refined.

    With all the concerns on this board...not one person has said the vehicle is unreliable. Most will not even admit how many miles are on their trucks.

    This speaks volumes. Now I will go back and crawl under that rock.
Sign In or Register to comment.