Question about 2000 GMC Jimmy

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I was driving my 2000 GMC Jimmy down the road and the rear tires locked up. The tranny was still in drive, but when i pushed down on the accelerator it didn't move and the rpms went up. I put it in reverse and it went back about 4 feet and the rear wheels locked up again. It seems like i can go 4 feet in either direction before the wheels lock up. I don't think its the tranny, because it was rebuilt 40,000 miles ago and i just changed the fluid. I think it might be something in the differential, but idk. Also it has 113k miles on it. Please help.

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  • Adam Sep 27, 2010

    Not yet. How do I drain it and and tell if its full?

  • Adam Sep 28, 2010

    I looked and there is no plug. Instead there is a hose that goes up to the wheel well and is capped. I guessed that this is the way to fill it. I looked closer at the cover and it looked wet, so i figured that it had a leaking gasket. I pulled the cover to discover that it was bone dry inside. While looking inside of it i noticed that some of the gears look worn down. I was looking and there are rebuild kits that you can buy. I was wondering how hard it would be to rebuild the differential, what special tools I would need, and if I could get a detailed guild to rebuild it. I also have a shop to work in so I have a lot of tools, but i don't have a bearing press if i would need one I know a machine shop. Just let me know. Thanks

  • Adam Sep 29, 2010

    OK. I went to and registered. There is no service manual for fixing the differential.

  • Adam Sep 29, 2010

    I looked at this manual and its the same as autozone. It doesn't give anything on the differential, except for the pinion seal.



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The differential may be locking up on you. Is the fluid full? Have you drained the fluid and pulled the pumpkin cover and looked inside to see if anything looks to be out of place or broken?

Posted on Sep 27, 2010

  • 2 more comments 
  • Nate Stansfield
    Nate Stansfield Sep 27, 2010

    There should be a plug that has a square in it. That square is the same size as a 1/2" drive ratchet which is what you can use to remove the plug. Then dip your finger in there. The fluid should be at the bottom of the hole. If not, add some. If you feel like taking a look inside, place a drain pan underneath, remove all the bolts and slowly pull the cover off and all the fluid will drain out.

  • Nate Stansfield
    Nate Stansfield Sep 29, 2010

    It's not to difficult at all. Especially if you have an air ratchet and socket set and a bearing puller.
    Go to and register for a free account. Then login to the account, and choose vehicle year, make, model and engine size. Then click on the view repair manual link. Now you have a free repair manual with everything you will need

  • Nate Stansfield
    Nate Stansfield Sep 29, 2010

    Go to this site. It will ask you to enter a number for passcode or card number. Enter 22510011327253

    Once you are loged in, choose your vehicle. Trailblazer is the same as the jimmy. Then you can view a full free chilton manual. Even on the autozone site, use the chevy trailblazer manual which is the same differential as the jimmy.

  • Nate Stansfield
    Nate Stansfield Sep 29, 2010



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Best of it
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