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Chevy Silverado and GMC Sierra Transmission Problems



  • kelsan1kelsan1 Posts: 34
    My truck does this on occasion when engine is hot or cold. The downshift is a loud thunk noise when coming to a halt and the engine revs drop to about 500/600 rpm range.

    I have checked the trans fluid hot and it is withing specs so I am concerned about the tranny since I plan on keeping this truck for a long time.

    Any help would be appreciated and I am taking the truck into the dealer this week for review of the problem.
  • gmcustsvcgmcustsvc Posts: 4,004
    Hello Kelsan1,
    Thank you for getting back with me. How long has the condition been present in the vehicle? Can you please email me so I can get some more information from you? If you click on my name you will see my email. Thank you,
    Mariah GM Customer Service
  • tanngrewtanngrew Posts: 1
    having mayjor transmission problems with my 09 toook it to 3 dealerships n got bs excuses they wont even look at it. if i dont get a solution next visit the truck will be parked outside the dealerships with decals saying mayjor problems feel free to test drive. ill deal with driving my old reliable ford for work.
  • kelsan1kelsan1 Posts: 34
    Took my truck into the selling dealer yesterday and they did a flush on the trans and did a remove/replace prop shaft and clean/lube splines. They did tell me that the prop shaft fix was temporary and could work up to 30K miles before it was needed again. Since then it seems to have cured the hard downshifting I was going through but time will tell.
    I had thought I would trade my truck in on a new vehicle but since I have been reading about all the tranny troubles with the 6 speed automatics I will wait and drive it till the wheels come off.
    Look through previous posts to mine and yours and see ones wtih Mariah of GM Customer Service and see if you can get some relief with her on the case. Good luck on you needed repairs.
  • bhodgdenbhodgden Posts: 1
    I have a 2000 Chevy Silverado 1500 Z71 with 5.3L. I had a problem arise a year ago. Whenever I would drive on a long trip and then come into a town, when I would take back off from a stop sign or light, the transmission would shift hard into second and third gears. I had the transmission flushed and filters changed. They found one of the solenoids broken ($5 replacement) in the transmission. Well this past weekend I was pulling my boat back from the lake when it started to do the exact same thing. Is the transmission fried? I need to find something out soon. I don't want to pull my camper or boat anymore if the transmission is going out.
  • gmcustsvcgmcustsvc Posts: 4,004
    Hello Tanngrew,
    I am from GM Customer Service. Can you please email me more information about your situation so I can look into your concerns further? You can get my email by clicking on my name. Thank you,
    Mariah GM Customer Service
  • acorteseacortese Posts: 1
    I am getting a check engine light, on my digital screen I am getting a Hot Transmission, and my truck is shifting harder than usual. People have been telling me that it is my TCC solenoid, and one guy said that wasn't it? What is wrong
  • myalemyale Posts: 2
    edited June 2010
    I have a 2007 GMC Sierra 1500 Z71 with 48,000 miles on it. The transmission has some sort of glitched as I approach or depart a light or stop sign. Instead of a smooth shift either up or down I feel a sudden locking of the transmission or something of the sort resulting in a "sudden jerk". This has nothing to do with the locking differential which works well in slippery road conditions
    When I purchased the truck apparently it came with a yoke that was not sufficiently greased as many times this manifested itself as though I had been rear-ended lightly when stopped at a light. The GM dealer greased the yoke and this helped. But now I have this problem. Could it be that the yoke has to be greased again ? Does the yoke have to be greased several times over the life of the vehicle ?
    I have checked the fluid level and it id right within specs and the color is still bright red. I've never used the truck to tow anything. Any Ideas ?
  • i have a 2007 sierra 2500 hd two wheel drive when coming to a stop the trans down shift hard and cause the truck to lunge forward . also was traveling at apx 45 miles an hour went to pass a car stepped on accelrator hard and the trans slipped causing the engine to rev but no increase in speed wondering if this is commom in the 6 speed transmission on these gmc thanks for any input
  • gmcustsvcgmcustsvc Posts: 4,004
    Hello Epphonehome1,
    I apologize that you are having issues with your vehicle. Can you please email me 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
  • First thing that would come to my mind, if its intermittent would be pressure control solenoid. High line pressure would cause it to be loud and hard maybe thunk.
  • filthyanimalfilthyanimal Posts: 2
    edited June 2010
    Hi, I am going to say what a pain.
    I have a 01 1500 4.3 po300 flashing engine light. let me say I have a scanner and consider myself to be somewhat knowledgeable. but I am looking for ideas.
    I have po 300 right bank 2 4 6 misfires engine obviously lacks power. barely runs . I have -35 degrees cam retard. Wont run long or fast enough to do crk learn. I think it is symptom of misfire not cause. I have pulled exhasut off pass side to eliminate the cat. doesnt change it without cat c onected. I got it to run long enough to set o2 code but it was for the heater circuit. I have read that the injectors should have 11-14 ohms resistance if checked at the pins in the upper plenum Anyone heard that. Mine do not have between 5 - 8 ohms. on the 6.. Is it likely all 6 injectors went bad at once. the fuel trim is being cut off on the even bank -25% while odd side is dumping +25%. I want to believe its come down to pcm ,spider,02's, possibly maf but it doesnt change and has comparable readings to my v8 burban. i am open to ideas distributor, but that would explain timing but not dumping of fuel
    fuel pressure is koeo 62psi, and 58 barely running. Thanks
  • cb_cb_ Posts: 1
    My '99 Silverado has suddenly lost reverse. All the drive gears work fine & the tranny fluid is OK so what would cause this? At over 225,000 miles is this the beginning of the end for my tranny?
  • ftosrodftosrod Posts: 1
    I have a 04 Silverado and right after my truck passed 70,000 miles, it began not engaging in reverse. This doesn't happen every time but probably 3-4 times a month. One thing that does happen every time is it shifts really hard when I put it in reverse. It also makes a loud noise, like it's hunkering down. This is very frusting because I bought this truck hoping that I would not have to worry about making expensive repairs! I am thinking I will have to buy a new transmission by the end of the year! Does anyone have any ides what is causing this? I really don't want to trade my truck in if this is a sign to other things that might be coming! Thanks everyone!
  • jimhenryjimhenry Posts: 2
    Chatter when transmission shifts from 1st to 2nd. Coincidence or not but my battery went dead overnight and after new battery was installed this problem arose. I took it to chev garage and they said if the cables were shorted together that the computer would have to relearn my driving habits and it could take up to 300 miles. I have driven 100 miles now and it shifts okay cold but after warm up still chatters. Anyone heard of this before or is this BS advice? He also said it may do this because I have Amzoil in tranny and it is more responsive to friction or something like that. No code lights on and 93000 miles on my 2002 Silverado Z-71.
  • alanwaalanwa Posts: 1
    edited June 2010
    Just happened today. 2003 Silverado HD 6.0L 4sp overdrive transmission with 92,000 miles. Parked it a week ago and had absolutely no issue. Went to drive it 1 week later and the transmission kicks real hard going from 1st to 2nd; kicks very hard going from 2nd to 3rd, kicks hard going from 3rd to 4th. When I started it up, put it into reverse and usual it begins to move on its own; this time it sat until I fed it gas. Is this transmission or rear end? Any suggestions?
  • kelsan1kelsan1 Posts: 34
    Please see my post from a couple of weeks ago regarding the drive line/rear spline grease repack. The dealer told me that it could help from 6000 to 30000 miles but no set guarantee. It has stopped the hard downshift completely for now, it was about $100 to drop the driveline and grease it and replace the driveline back. Hope this helps you.
  • kaykay387kaykay387 Posts: 2
    Don't mean to discourage you, but in case you did not read all the Chevy transmission problems: We bought a 2500HD new in 2002 and the transmission has gone out twice. We do not drive many miles and we do not tow anything except a very small livestock trailer. The only time we use the trailer is to haul maybe one or 2 cows a couple of times a year to our pastures with a round trip of about 6-7 miles. We hire a truck for anything more. When the transmission went out again a couple of months, ago the specialist asked how is it we "trashed" 2 so fast? Then he researched and found this is a re-occurring issue on these transmissions. So much for being loyal GM owners for 45 years!
  • So i have a 2006 GMC 4 wheel drive pickup with auto and today i go to take the kid to a ballgame and while cruising down the highway i went to accelerate and nothing...just like it was spinning in gear (i was in overdrive). Only gears that would work are 3rd, 2nd and 1st. No drive/overdrive... The truck only has 42,000 miles! I stop and i have to go 1, 2 and 3 to move... Warranty is up ...ahhh! Is she toast? Should i send her into the river and tell the insurance company i can't find it :) :) :) ? This is my "whiteknight"...its hard to bag a monster buck when i'm missing a few gears. If i have to, i'll get to my tree stand in reverse!

    Thanks for any help... I'm going to go cry now.
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