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GMC transmissions & drivetrains repair questions and answers

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  • Ron
    Ron - 2001 GMC Savana 1500 - Transmissions & Drivetrains - 3/28/2015
    Should I have Transmission FLUID & FILTER CHANGED with 125,000 miles on this Handicapped Van?
    There are NO PROBLEMS shifting or Running. This Van was Cared for "METICULOUSLY". Except for Trans Filter & Fluid. The Van Looks and Runs Like New. {Seriously} & (Garage Kept). It weighs 8,000 LBS. and has 125K Miles. "Should I change Fluid & Filter"? Will it ...
     
    • Teddy B
      3/27/2015 Teddy B
      At a 125,000 miles having possibly never changed the trans fluid
      it is about at the end of the road--so do not change it

      If your saying 125,000 K or 75,000 miles -- then change it

      I would not use the newest DEXRON VI low viscosity fluid
      Use the Dex/Merc for your year vehicle

      ALL TRANSMISSIONS GET FLUID CHANGES EVERY 3 years
      & not based on mileage
      Two hot summers & 45,000 miles the fluid is toast,not able to
      remove heat any more & all the additive pkgs are used up

      That is why trans fail by the millions every day of the year
    • Jimm
      3/28/2015 Jimm
      Yes, go ahead and change the fluid and filter - it needs to be changed anyway. If there are no problems shifting - then you will not have lost anything. Look at it this way, if the fluid and filter is not changed,the transmission will be ruined eventually anyway.
  • russ
    russ - 2001 GMC Sierra 1500 - Transmissions & Drivetrains - 3/16/2015
    When cold the automatic transmission slips in reverse only
    25000 mi. on rebuilt transmission 460e model. If I leave in reverse with the brake on and wait 5-10 seconds it doesn't seem to slip. Once I use reverse once or twice it doesn't do it again until it is completely cold again. It just started all at once in extreme ...
     
    • Jimm
      3/16/2015 Jimm
      First question - what is the transmission fluid level? Slow, slipping or no reverse: "lo-reverse" clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. It is possible to remedy a fluid problem by removing the checkball from its cage in the case in the rear of the transmission may help (must remove valve body), or adding a high-viscosity additive or other seal restorer product. May also have worn boost valve (can replace in the pan).
  • Pjuperesa
    Pjuperesa - 2001 GMC Yukon - Transmissions & Drivetrains - 2/24/2015
    How much, and how long, should replacing the front differential? on a 2001 GMC YUKON DENALI AWD.
    The same shop just replaced the transfercase. $1600. I'm told the front differential needs to be changed, another $1700,
     
    • Jimm
      2/24/2015 Jimm
      Check the 'EstimateCost', the 'Find-A-Shop'and quotes features on the AutoMD website for this repair. The front or rear differential may develop an abnormal noise due to worn bearings or another internal fault. I think the labor is about $800.00 give or take some change & the parts are about $400-$500.00 depending on how much you replace - which in my opinion if your in there that far, replace the pinion bearings also.

      Try these on-line resources for the front differential unit; www.midwesttrans.com/chevy_gm_8.25_front_centersection.html, www.diffwizard.com
  • Pjuperesa
    Pjuperesa - 2001 GMC Yukon - Transmissions & Drivetrains - 2/24/2015
    How much, and how long, should replacing the front differential? on a 2001 GMC YUKON DENALI AWD.
    The same shop just replaced the transfercase. $1600. I'm told the front differential needs to be changed, another $1700,
     
    • Jimm
      2/24/2015 Jimm
      Check the 'EstimateCost', the 'Find-A-Shop'and quotes features on the AutoMD website for this repair. The front or rear differential may develop an abnormal noise due to worn bearings or another internal fault. I think the labor is about $800.00 give or take some change & the parts are about $400-$500.00 depending on how much you replace - which in my opinion if your in there that far, replace the pinion bearings also.

      Try these on-line resources for the front differential unit; www.midwesttrans.com/chevy_gm_8.25_front_centersection.html, www.diffwizard.com
  • JaxHenry
    JaxHenry - 2008 GMC Acadia - Transmissions & Drivetrains - 2/24/2015
    I just replaced transmission in car. THe stabilitrack light is now on, the engine light remains on and it has a delay ?
    While driving, I push the gas and it won't go, when I push it more, it will jump and jack rabbit ahead. The mechanic said it's not transmission but I did NOT have this problem before
     
    0 answer
  • Adam
    Adam - 1993 GMC C1500 Suburban - Transmissions & Drivetrains - 2/18/2015
    4 wheel drive won't engage.
    4 wheel drive just won't engage
     
    0 answer
  • ccwallpa
    ccwallpa - 2003 GMC Envoy - Transmissions & Drivetrains - 1/25/2015
    When car rev when going up a hill then makes a clunk/jerk and goes. Also when backing up it will hesitate
    I have 120000 miles. It just started doing this. Seems to be more and more. When backing up it will hesitate and then goes and sometimes with a clunk.
     
    • Chevy doctor
      1/25/2015 Chevy doctor
      I would check rear ujoint on your prop shaft. Sounds like its binding
  • seabee
    seabee - 1999 GMC Jimmy - Transmissions & Drivetrains - 1/10/2015
    Lights on 4 button 4 wheel drive control don't light
    lights wont light under 2w 4wh 4wl or auto 4wh.I checked fuse replaced 4 button box lights still don't light or goes into 4 wheel drive.
     
    0 answer
  • gb
    gb - 1998 GMC K1500 - Transmissions & Drivetrains - 12/24/2014
    Transfer case and front end actuator for 4wd are goofing up
    my pickup is having a slight problem I just put In a new 241 c transfer case but its a different style it has the cv shaft style and the stock one was a solid shaft the first problem I noticed is the hookups for the wires are different I don't know how I would fix ...
     
    0 answer
  • Shawna
    Shawna - 2004 GMC Yukon XL 1500 - Transmissions & Drivetrains - 12/23/2014
    Why does my stability system disable keep coming on
    I fixed the sensor and my truck was running fine but now it keeps coming back on saying that the stability system is disabled
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2004 GMC Yukon - Transmissions & Drivetrains - 12/15/2014
    My truck,s transfer case keeps shifting out of 2wd to Natural.
    The first time it did it was after driving and parking, when we came out and started to leave the transfer case was in Natural, We had to put the truck in auto 4wd. I haven't tried just pushing the 2 wd. I am thinking that might have worked.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2004 GMC Yukon - Transmissions & Drivetrains - 12/14/2014
    My truck keeps going into Natural. First after parking and when I put it in reverse it wouldn't move,
    when I pushed the auto 4 wd it worked. Now it kicks into Natural when driving in 2 wd.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2004 GMC Yukon - Transmissions & Drivetrains - 12/13/2014
    My Yukon transfer case keeps shifting into Neutral. I am guessing its the shift motor on the Transfer case.
    First time I noticed it, we would park and when we came back and started the truck, it wouldn't move, when I hit the auto 4 wheel it was fine. Today my wife said it kicked out driving down the road. Thanks for any help you can give me.
     
    0 answer
  • 812dobie420
    812dobie420 - 1998 GMC C1500 - Transmissions & Drivetrains - 12/10/2014
    Why doesnt 4x4 work since changing rear end
    Had 3:73 gear in rear end and now have 3:42 geats
     
    • Teddy B
      12/10/2014 Teddy B
      You CAN NOT install a different rear gear than was there from the factory
      as you will have different ratios front to rear IF you were to use the front
      axle in 4 wheel drive

      I would guess you know that
      The transfer case would be in a bind & last about 5 miles before
      exploding

      Why it won't engage or other issues--I have no idea what your doing or
      if there are other issues in the vehicles systems
  • DIYMAMA
    DIYMAMA - 1999 GMC C1500 Suburban - Transmissions & Drivetrains - 11/30/2014
    Why wont my 4wd disengage but seems to not be working?
    I live in Montana and we have a lot of snow! With that said I NEED my 4 wheel drive now and again. This is a newer car to me so im just learning its issues. First off the lights in the switch dont usually work, But when i put it in neutral and hit the 4 hi or the 4 ...
     
    0 answer