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Chevy Silverado and GMC Sierra Transmission Problems



  • I have a 2007 Silverado 1500 Ext Cab that constantly is making a rattling noise at 35 - 50mph. It occurs when I step on the gas enough to engage the engine. It seems to be an issue with possibly the overdrive gear since if I drive with it in 3rd, it never happens. It acts like it wants to either downshift or stay in overdrive but can't make up its mind and that is when the rattling in the engine compartment takes place. It is annoying but more so concerning since the truck has 21K miles on it and it just doesn't make sense that it only happens from 35 to 50mph and at 1500 RPMs or less. Just don't know if there is something bigger here.

    Been to the dealership twice, they have no told me to contact GM to see if they have any information on a possible fix or whether they have seen or heard anything like this. Truck runs the balls otherwise with the exception of 35 to 50.
  • I have a fleet with 4.8L, 5.3L and 6.0L engines. never had that problem. I would have it serviced to see if a fluid change would help. good luck.
  • obyoneobyone Posts: 8,054
    What you are describing is nothing new and is due to the torque converter lock up at approximately 39 mph causing the engine to lug. It due to the large gap between 3rd and 4th gears and has been around since '99.
  • need to figure out a problem im having.. my trucks got a 350 and 4l60e and its 4x4 if im stopped a light or something and i stomp on it, it'll kinda stutter or will die i cant burn out or anything, if i just gradually push the gas its just fine. 1 person said this is my fuel pump but its not humming or whistling and if the trucks in p or n and i rev it up it doesnt stutter or anything, any ideas? fuel or trans? thanks
  • I recently replaced my trans filter and pan gasket and the truck was running perfectly prior but now will not go forward in drive. Reverse is perfect yet when put in drive you have to give it all kinds of gas and raise the rpms up high in order to move forward almost like its trying to drag a freight train. Anyone have any suggestions?
  • I recently purchased a 01 silverado with 60k on it (auto 4x4 4.8 v8). bought it from a guy who did some light vacation towing and commuted with it. went to get a 60k check and the mechanics told me you got a solid truck ( no problems, leaks, discoloration or nuthin). well i live in queens NY( no hills) so i decided to take it up state, shifted smoothly the whole way, BUT when you hit your first incline it slows down a bit and makes this squeeling, metal like bending noise, then you aplly some pressure to the pedal it goes good, then when you let off the pedal goes back to the noise, whats the problem? whats the cost$..thanks need all the help i can get
  • I recently bought a used Z71 Silverado with a 5.3l Vortec and 4 spd. auto transmission, Four wheel drive, extended cab, short box.

    Today, the transmission started slipping. Feels like it moves into neutral and the engine revs increase. Fluid is on the full mark, has a nice red color and does not smell burnt.

    Had a major snow storm this weekend, so I have been using 4x4 a lot, shifting from Auto, to 2H, to 4H.

    Could the problem be in the transmission itself, or could it be the transfer case slipping into neutral?
  • Wilefox.

    Have 05 silverado 5.3 liter.... got towed from whiting Iowa to freemont nebraska @ bout 2pm today... tranny kicking in and out. boosting rpms from 1800 to 2500 everyonce in awhile.. then was like it was stuck in 3rd gear or something. went to 3000 rpms for bout 2 miles... I slowed down. to 45 mph... then tranny hot errror popped up I pulled over called AAA had her towed. Power train warranty expires Dec 29th 2009. 5yr/500000... I have 46000 on her. I have read lots of probs... weird to see ours went out bout same time same day.
  • wilefox


    called dealer this AM to tell them the truck is sitting outside. they notified me that they had 4 vehicles from last week with tranny probs and mine and a couple others came in over weekend.

    Interesting .... i will keep u posted on what happens... let me know what you find too!
  • I think I have the same problem as you woodman1062. I have a 07 GMC SIERRA 4X4 and I have a bad vibration anywhere between 1000-2000 rpms, but it only occures in the overdrive gear. The other gears work and shift fine other than this vibration in OD gear. I haven't found the problem yet, but when i do I will let you know if you find out let me know. thanks
  • I have a 2000 Z71 will not change into 3rd or 4th gear but 1st and 2nd are fine some people have told me there is a relay for the trans.that might be bad
  • catamcatam Posts: 331
    Unlikely, you probably need a rebuild.
  • My 98 gmc z71 is doing the same thing did you get your fixed and what was the problem
  • My 2000 GMC Sierra 4x4 has been having trouble shifting from 3rd to OD latley since it has been so cold (15-20 deg). It's like the computer is telling it to not shift. But sure enough about 2 miles into the morning commute, running 60 it decides the transmission is fine and shifts just like normal and I dont have problems with it the rest of the day. I have noticed this ocassionally at lower gears also but only when the truck is really cold and sits overnight. The people I had do an inspection when I bought it said the transmission was in perfect shape and the fluids were clean. Any suggestions before I dump money in to get it looked at?

  • catamcatam Posts: 331
    Check your owners manual.
    I know on my 09, that overdrive is locked out by the computer when temps are too cold. My truck behaves just like yours does in cold weather in the morning, I have to drive until engine temp is at least 160 before truck will shift into OD.
  • I have an 07 1500 silverado classic that has a recent issue. As the temp. increases, it gets worse. When leaving a red light, the tranny shifts from 1st to second, but after the shift, there is a jolt. The engine doesn't change rpms or anything. I even think it actually shifts. But the jolt is unusual. Anyone have this problem?
  • My truck has the exact same problem. Jolts when it shifts to second. Doesn't do it everytime. Seems worse when I'm going slow. I don't notice it if I'm really getting on it...I just got on this site today to see if I could get an answer. Someone please help us!

    Mine is a 2007 GMC Sierra 1500. 58,000 miles. It's got the 6.0 liter. Not sure the specifics on the transmission.
  • jimittjimitt Posts: 1
    I also have this problem and have talked with others that have. Check with dealer at one time they say live with it they know of the problem but? I bought this truck hoping to have a smooth shifting truck. 07 GMC Z-71
  • Go over the dealership's head,
    There is a contact us phone number on this link.

    I had 2 Chevy transmissions crap out on me, and the third is a performance trans that I had built. You don't want to spend what I did, especially if you're still under warranty.

    That stealership is being lazy. Get to the Regional GM Rep.
  • I have an 04 silverado that does the same thing.
    it now has 1338000 miles.
    its been doing this since it got it brand new.
    the dealer said there was no problem.
  • donl1donl1 Posts: 112
    1338000... ;) That's alot of miles.
  • My tranny gauge suddenly started reading high (almost max) - had everything cleaned and fluids/filter changed but still reading hot - repair guy believes possibly gauge is wrong or computer because he can't find anything wrong - after couple of days it still reads between 250 and 300 after about 50 miles of driving - no other issues other than a "shudder" when pushing down on throttle but that only happens occasionally - any ideas or anyone else hear of this? It's driving me crazy especially since I have been reading about tranny problems others are having. Any advice appreciated. 80K on truck and I bought it new. Thanx.
  • I have a '91 Silverado with a 30fried. Whilst towing a trailer, I noticed the truck having problems shifting and no power. I found there was no tow kit and tranny fluid was extremely hot. A month later, I have 1st and 2nd but nothing else.
    Before I put out all kinds of money I don't have for diagnostics, I thought I would post here to see if anyone can help.
    I am told it could possibly be a "shift coil". I'm not too mechanically inclined so any info would be greatly appreciated.

  • 88gmc88gmc Posts: 1
    i have an 88 gmc and my tranny is doing the same thing i have first and second gear and thats it i changed the tranny and it is still doing it i am out of ideas if any one has input it would be greatly appreciated

  • need help. 1995 silverado z71. says check gauges and then transmission or clutch feels like its slipping. it shows no light under the PRND321 in any gear. it only happens every now and then and when it doesnt do this it drives and shifts fine. after shutting it off or leeting it sit over time it basically resets itself and will drive fine after this time.
  • Ops i ment 138000.
  • Maybe a solinoied thats getting hot.
  • I have 99K miles, had tranny serviced at 30k intervals, problem started with a shudder while backing uphill towing a trailer. Seemed like clutches were catching and releasing.
    Last night I was backing up, same symptoms but then engine rev'd and no more reverse. Tranny temp got warmer than normal but not in red zone. I hoped it would be better this morning after cooling down overnight. No luck, still no reverse. I talked to an old GM guy at the builder show in Los Wages Nevada last week, he says it is a known issue with the 80 series tranny. Am I in need of a tranny b4 I get my first brake job ? Is the reman tranny from GM that come in a coffin the best bet? If I install it myself is the warranty still valid? I have 3 of these trucks, should I expect them all to have tranny failure at 100k.
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