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Chevy Silverado and GMC Sierra Transmission Problems



  • I have a 2005 Sierra with similar though not exact symptoms. The dealer informed me that the error codes suggest that the issue is the encoder motor, which is a device (mounted on the front differential) that shifts your front differential in and out of 4WD. It responds when you push the Auto 2WD 4WD and 4WDL buttons on your dash. My encoder motor no longer responds to my button pushing (i.e., will not shift in and out of 4WD), though up to recently it responded intermittently. An encoder motor is more than $700 installed at the dealership. I found a place online where you can get a remanufactured one with a lifetime guarantee for just $299. I have been told that it is a simple installation for anyone who can turn a wrench and plug in a lamp. I'm going to order it today.
  • friend i really appricate the info except it doesn't explaine all of allison problems:new tranny/torque converter 3 new tranny lines new starter 8 new injectors and 16 new push rods. this all happened at the dealer. i didn't know a 45k truck was supposed to self destruct at 29k miles. maybe fred flintstone wasn't so stupid after all !! still driving my rental pos
  • tedp1tedp1 Posts: 2
    Sorry for the delay. Thank you for the help. I'll let him know and see what he says.
  • svroomsvroom Posts: 1
    When I floor the accelerator for passing gear, the transmission does not upshift when it should. The engine will wind to 4500 RPM and the transmission is in low gear or second. The transmission works fine normally.

    no DTCs for the transmission. :confuse:
  • I have A 01 silverado 4.8L great truck!
    but every so often starting from A stop it will
    seem to hesitate in the tranny. almost like the
    the brakes stick.Any one have A problem like
  • I have a 93 Silverado 204,000 on it, has always ran great except a couple of weeks ago I noticed that when I take off The trans shifts way to quick into the overdrive gear which bogs down the truck. It's fine when I manually shift progressive through the gears. Any solutions?
  • fiberguyfiberguy Posts: 1
    Looking for anyone else that has an 8.1 with the 6 Speed manual---Mine has developed a rattle near the base of the shifter, it only can be heard under acceleration or load. It happens in all gears dealer can not tell me if this is normal since they work on very few of these transmissions.

    I am hoping maybe another owner can help.

  • grumphygrumphy Posts: 6
    I have an 04 1500 silverado with the 4.8 motor.
    The tranny slips only when hot and at low rpm when shifting from first to second.
    on fast acelration it shifts fine.this only happens from first to second and only when hot on low aceration.trans was flushed but no change.
    thanks for any help
  • bigt442bigt442 Posts: 6
    I have a 1997 Silverado 4l60-E transmission with no reverse, I rebuilt the trans and now the truck is locked down and will not move even in neutral. It shifts in every other gear and will move forward. You can tell it shifts into reverse but acts like the brake is on, what could the problem be? any clues? This makes the 4th one I have rebuilt and this is the first time with this problem. :confuse:

  • fordfan_17fordfan_17 Posts: 175
    ok drop the pan and put the 3 8mm bolts where they are supposed to be i know exactly what happenned. as i made this mistake myself quite a few years ago all 3 8mm bolts go 1 to left of epc solenoid and 2 even with wire connector what has happened is you one of these bolts in the wrong place if you need a picture lemme know ill get it for you
  • fordfan_17fordfan_17 Posts: 175
    have you had the filter changed ???? some shops will use silicon on the pangasket blocking the 2-4 exhaust hole which will cause servo problems....if there is silicon on your pan gasket get it off 2-4 band failure will happen if you dont
  • bigt442bigt442 Posts: 6
    I have the pan off and will move the bolts as you say. If you have a picture that would be great. Thanks for the quick responce.
  • fordfan_17fordfan_17 Posts: 175
    5 minutes check my photo album the location for the 3 bolts are in yellow paint
  • bigt442bigt442 Posts: 6
    Thank you very much!!!! :shades:
  • bigt442bigt442 Posts: 6
    Fordfan 17
    Just wanted to let you know it worked. You are the man and thanks so much for the help. I will pay more attention the next time.

  • fordfan_17fordfan_17 Posts: 175
    np at all... hope i helped you give me some ranking :) lol j/k
  • i have a oo sierra with 5.3. its slipping in reverse like its not totally engaging i can hear it go into gear but wont seem to grab. this is the third transmission i have put in and really cant afford to do it again. any suggestions
  • I wrote before but never got any feedback so I thought I'd try again. My truck occassionally shifts really hard into 2nd gear. It seems like it this mostly happens before it is warmed up but can happen at any time. Downshifting seems fine. I've had it in to a tranni guy who sent me to GMC to have the computer reset. The GMC guy took off the pan, found no filings or anything in the oil could not visually see any problems.

    Also, when I bought this truck, there was no manual--it has electronic 4x4. I change into 4H up to about 60 kph. 4L I change in Neutral. Is this correct? Also, my friend changed into 4x4 with the steering turned hard (I nearly freaked)--did she damage U-joints or anything?

    Finally, does anything know where I could find a manual and/or a keyless remote (the truck did not have those either!) :blush:

    Thanks Ali
  • Does anyone know why this is happening....once my Sliverado 1500 4x4 has been sitting on an incline not running and I go to start it and put it into reverse the truck dies. I have to coast in neutural until I get to flat land. Once on flat land I can go forward. Any ideas?
  • diton908diton908 Posts: 7
    how do you bleed the clutch is it just like bleeding brakes or what the bleed is on the slave cyl i replaced the line between the master cyl and the slave cyl cant get the clutch to feel right and it pulls when the clutch is all the way depress i know that isnt right and i think i have air in the line but cant seem to get it all out if you could help thank you

    95 chevy 2500 5.7 #50 V8 4x4 5 Speed
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