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Chevy Silverado and GMC Sierra Transmission Problems



  • Hello everyone I have a 2000 GMC sierra 1500 5.3 lt that backfires and misses while going down the road at low RPMs when it is high Rpms it cleans out or runs better changed maf sensor and didn't seem to help runs better with it unplugged has anyone else had this problem? I have thought of everything and can't seem to figure out what it might be. Thanks!
  • I have a 2000 1500 sierra 5.3 3.73 gears, with a cat back exhaust, throttle boby spacer, and a cold air intake system. I' m thinking of adding a programmer for more power when towing. I tow a 31 foot travel trailer weighing about 7500 lbs loaded. I'm looking for input for the best programmer, for the most power. Thanks, Marc
  • mike480mike480 Posts: 2
    I have a 99 Chevy 2500 4wd, that locked up today, but not in reverse. I backed out of my driveway and when I shifted into drive, it would not move. You could tell it was the front diferential that was stopping it from moving. I tried several times going into reverse and forward and it would not budge. I assumed it was screwed. I called a tow truck and we had they had to drag it onto the bed, with some type of sliders they put under the front tires. About 3/4 of the way up the truck, a loud bang happened and one of the front tires started to turn. Ok, got to the shop and unloaded it, Checked to see if it would move forward, and it then worked fine. Any suggestions?
  • obyoneobyone Posts: 8,054
    Which trans cooler is that? Factory? Aftermarket? Checker's special?
  • I am looking for a good quality trans cooler, trans shop said an LPD style that is good for the winter--any suggestions???? There are so many to pic from on EBay. Would I be best to get an OEM trans cooler from the dealer that includes the lines etc. What part number would I get??? The OEM style I saw on EBay looks like you just hook up directly to the trans and then to the cooler--does this mean you are to plug of the ports at the RAD and just use the Trans Cooler only as a means of cooling?? I have a 2001 Silverado 1500 4x4 4.8L--does not have the towing package--it's a base model.
    This is the info I saw on EBay:

    2000-2007 Chevy Silverado 1500 Transmission Cooler
    Genuine GM Part Number: 12497071

    Recommended for trailer towing upgrade w/ 4.3L (LU3, L35), 4.8L (LRV), 5.3L (L59) and 5.7L (LM7) engines. Helps prevent transmission overheating.
  • obyoneobyone Posts: 8,054
    I ran that part no. at The small radiator is installed in front of the factory radiator. It plugs into the return line from the radiator. It's a simple install once you see the directions that come with that unit. BTW, I'd order it using that part no. as it is OEM and should plug and play with no problems.
  • If you notice when you look at the lines that come with it, they look pretty long as if they are meant to go to the Trans itself???
  • obyoneobyone Posts: 8,054
    edited April 2010
    The lines aren't that long. If it's to scale with the trans cooler the lines won't be more than a couple of feet as they connect near the radiator to the "out" line from the radiator that returns the fluid back to the trans. The hardest part of the install will be to strap the cooler to the front side of the truck in front of the radiator. Shouldn't take more than 45 minutes to install.
  • Am I correct in assuming that the top line on the Rad is the return line to the Transmission??? You sure are alot of help----THANKS
  • obyoneobyone Posts: 8,054
    Not sure. I'll have to look it up in the shop manual and post. Actually it's been awhile and can't remember. ;)
  • gmgwmc3gmgwmc3 Posts: 3
    I have a 93 Chevy Silverado . My transmission works okay in drive, overdrive and reverse. It will not move in the gears one and two. The transmission shifts good up thru drive, Could anyone help me with this problem. Sure would appreciate it. Thank you GMGWMC3
  • I had a similar problem. I ended up replacing the transmission control module. These were the other things I had going on:
    One day it was very sluggish in drive and when I got to destination there was no reverse. Started up 3 hours later and no problem
    Two months later started it up no gears would engage. Went away for a long weekend started up went in gear, no problem.
    Before the gears problems, my dash gear indicator went out and I had to count gears to get into drive.
    Bought the truck used 3 years ago and the Trans temp gauge had never worked.
    Once the TCM was replace no gear problems, gear shift indicator came back and now the Trans temp gauge works.

    The first shop thought it was the main computer, hard time getting a read. Referred me to another shop and inside 20 min they found the problem with the TCM.

    Happy with fix, very expensive though.
  • wol4rinewol4rine Posts: 1
    I just got my 07 z71 back today. The transmission had to be replaced. A bearing went out and came apart. 77000 miles!!
  • Thats what the dealer called it. I have a 2004 Silverado 5.3 Liter Z714x4 with 85,000. The transmission started slipping when driving home from work and wouldn't shift to 3rd or overdrive. I took it to two of the best transmission garages locally and they gave the same diagnosis.

    The transmission has failed because the casting of the transmission housing prevents proper lubrication to the 3rd and 4th gears. Depending on how the truck is used may depend on when they finally crap out.

    I called GM and they said that I needed to take it to a GM dealership to have it diagnosised before they could do anything. Well they told me it was catastrophic failure and they could fix it for 2200.00 but can't guarantee that it won't happen again.

    If they replace it with a new tranny for 3300.00 they can warrant that it won't happen. DAH !!!!!! must be a problem with that tranny like both shops said. I have found numerous people on the net with the same issue.

    I have been a devout Chevy man for 33 years and my trucks aren't used for plowing or towing. I see that some people have had this tranny replaced 2,3,4 and 5 times??????????
  • I have a 2009 sierra 1500 with the new 6-speed auto tranny. I cant find anyone else having issues with the tranny. My truck just hit 10,000 miles. Truck shifts hard from 1 to 2 and sometimes from 2 to 3. Almost feels like a shift kit in a hot rod! Also has a long delay when engaging into reverse. Have taken to the dealership 2 times and they cant duplicate it. Although, the technician did ride with me and the truck shifted hard. Yet when i left, they couldn't duplicate it with the computer hooked up. Has done it since i bought it new but thought it was cause the truck was cold since i bought it in the winter. Warmer weather now and has not changed. The dealership said they couldn't do anything about it because they couldn't duplicate it and obviously the problem wasn't major "YET".

    Also, when braking to a complete stop, it almost feels as if the truck is in tow mode. Tranny seems to downshift slowly and i have to apply brakes harder due to it trying to continue to go. Now the brakes are squeaking.

    So needless to say, I have bought a $33,000 truck that didn't come with a much needed neck brace or a supply of brake pads. Very disappointed.
  • gmcustsvcgmcustsvc Posts: 4,251
    I am from GM Customer Service. Can you please email me at for more information? Thank you,
    Mariah GM Customer Service
  • ahinsonahinson Posts: 17
    have 83 truck w/overdrive.put new filter and trans fluid in truck.shifted fine for about a week and now will not shift out of please.could it be the front pump.
  • 2doorpost2doorpost Posts: 74
    Drove this morning to the store- truck sounded like there were a bunch of marbles rolling around when the trans was engaged to drive , reverse...etc. Stopped making noise in neutral and park.

    What the heck could be making the noise?
  • It's me again, just wanted to update everyone with my dealing at GM over this problem. Well last Thursday a District Manager called me back and said that GM wants me to pay my local dealer 400.00 to do a through diagnosis on my truck.

    I know she hasn't met me so I must sound stupid on the phone. If I do that GM still can't guarantee that they will pay for anything at all. I told her that they don't need me to do that since I've already had two transmissions shops and their dealership tell me the same thing by just driving it.

    They want 2200.00 to rebuild without a guarantee that it won't happen again so why would I want to pay them another 400.00 of my hard earned bucks? I just laughed and said " you are kidding me right". She then told me that she had to talk to another District Manager and call me Friday.

    She did call while I was on my bike going home from work and when I got home and called she was gone for the weekend of course. Tomorrow will be two weeks without the truck and I need to do something soon. I will call her this morning and if I get the same answer I will pull my truck from the dealership after paying 76.00 for a diagnosis that took 2 minutes.

    I am probably going to buy a used tranny locally and then trade it in because these trannys seem to like timebombs that can blow at any time. I have been set against buying anything other than GM but it may be time to break out of that mold.
  • gmcustsvcgmcustsvc Posts: 4,251
    Hello 2doorpost,
    I am from GM Customer Service. Can you please email me at so I can look into your situation further? Thank you,
    Mariah GM Customer Service
  • New to forum,seems preety good.Driving to work and at 3rd stop light tranny wouldn't shift on its own.It will however if manually shifted(for up shift)and will still down shift on its own.No weird noises,clunking or anything like that.Any and all advice would be awesome!!!
  • namesrusnamesrus Posts: 1
    Have 2009 silverado, 5.3 with six speed and same second to third HARD shift. Slams, bangs clunks whatever ....hard enough to scare the wife and make stuff jump in the bed of the truck. Dealer says same stuff, can't duplicate issue. PLEASE...let me know if you learn the GM guy that asked you to contact him for real?
  • gmcustsvcgmcustsvc Posts: 4,251
    Hello Namesrus,
    I am from GM Customer Service. Is the hard shift intermittent or happens all the time? Can you please email me with more information about your situation so I can look into it further? You can get my email by clicking on my name. Thank you,
    Mariah GM Customer Service
  • lamudducklamudduck Posts: 1
    i have a 2000 gmc z71 sierra 1500 with 236000 miles and a 4L60E trans the truck shifts trough 1st 2nd and 3rd just fine but wont go any higher. is this a big expensive fix or something simple ,and i have a friend that has a 4L60E transmission for a two wheel drive truck will it work on my 4x4
  • harley883harley883 Posts: 4
    I Harley again, just wanted to give yuo the final outcome of my dealings with GM. No good, they first offered to give me 20% off of a NEW tranny that cost 3300.00 dollars. No, mention of giving me a discount on a rebuild " I wonder why???".

    I told them no thanks, that isn't much of a deal for a lifetime Chevy owner. Then they called the next day and offered to give me a certificate for 500-1000 dollars off of a new truck. WOW!!! I could get that much off on my own. Have you noticed that they do respond to problems on this site with trucks that are 2008 and newer?

    Well I have been without the truck for two weeks now so I had to do something so I purchased a completely rebuilt tranny. I was told that it has all of the GM problems taken care of by replacing them with upgraded parts that should have been put in it to begin with.

    The cost is 1000.00 plus 259.00 shipping both ways to return my original one. I don't know yet what I will do once it's repaired. I may trade it on a new Toyota although I have a problem with driving non GM products.

    I have a number of friends and coworkers that own them and seem to be very happy with the trucks performance and reliability.
  • 2doorpost2doorpost Posts: 74
    Finally got another damp day- and I've nailed the problem down to the alternator- probably the bearings.

    Truck has 38k miles- I'll be heading off to a dealer with my info.

    Thanks for your support

  • kaykay387kaykay387 Posts: 2
    Read with interest the transmission problems. We have just put in our second transmission in our 2002 Silverado!! The first one was about 50,000 miles... We contacted GM then as we have been loyal GM patrons for over 45 years. They were “kind” enough to pay for part of the first transmission since it was "past" the warranty. We do not drive hard, only pull a small stock trailer 3 or 4 times a year with at the most 4 cows. The transmission we put in was a new one put in by a reputable company that only does transmissions. Last week it went out again! In all the vehicles we have owned (all with well over 150K-200K miles), we have never had to replace one before. We even have our 1980 Silverado running...thank goodness.
    We are trying to research the problem and we are working with the transmission company. They are testing it every 100 or so miles to see what is happening. I read one post that said it could be in the computer system.
    Can't trust any car company any more.
  • gmcustsvcgmcustsvc Posts: 4,251
    You're welcome Jim!
    Please keep me informed on how the repairs go. Thank you,
    Mariah GM Customer Service
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