GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 8 of 8
  1. #1

    Default rear differential

    hi ,

    I have a 1999 yukon, 4wd . i notice i always have a small leak where the rear differential is at. is there a D.I.Y on changing the gasket on here or refilling it. please help

  2. #2


    Where is it leaking: pinion seal or cover gasket or other? Cover gasket is easy (just remove the bolts, pull the cover off, clean it up and reinstall)? Do you have access to any manuals? Pinion seal procedure is detailed in Chiltons. If it has to be an internet based procedure, Autozone has the information from Chiltons on their web-site.
    Last edited by MrShorty; 04-15-2008 at 10:23 AM.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  3. #3


    if it is the cover gasket just take off the old one, take out or scrape off old gasket and clean up cover. let gear oil drain out and clean out inside of diff with brakleen to get all old oil to drain out. clean off inside of cover with brakleen as well and wipe everything dry. when inside of diff is dry, use permatex gasket maker (blue or black) and squirt liberally around the outside edge of the diff cover where it will meet the diff housing. push the cover on the diff housing and bolt it back on. fill the diff with recommended gear oil. I like to jack up the side of the axle that has the filler hole in it so i can get a little more oil in also. let sit a couple hours just to make sure the permatex dries and your good to go!!
    95 GMC Sierra 2500
    3" Body Lift, 33" Goodyear MTR's
    5.7L 350 TBI Edelbrock SDT Exhaust, Flowtech Headers, K&N Intake
    Sold :(
    1999 Jeep Cherokee, 3" Rustys lift, 33" BFG MT's, locked, armored: Rolled :(
    2000 Jeep Grand Cherokee Limited. K&N Intake, Custom Kolak Exhaust

    Contact this GMTC Moderator for any problems or questions you may have :great:

    Join the GMTC Facebook Group!!! Join Here

  4. #4


    thanks, i will try that this weekend. i was worried if i unscrew those bolts something might fall out.

  5. #5


    nope, the only thing comin out is some stinky gear oil so have an oil pan underneath it

  6. #6


    Quote Originally Posted by Pete95Sierra View Post
    nope, the only thing comin out is some stinky gear oil so have an oil pan underneath it

    And some rubberr glovs or the smell will stay with you for a while.

  7. #7


    where is the refill cap for the diffferential , i looked everywhere, only seeing a allen shape bolt on the side. it looks like the drain cap. can anyone post pics

  8. #8


    on the front pinion on the passenger side is a 3/8" square plug. All you have to do to open it is to stick a 3/8 drive ratchet extension in there with a ratchet on it. There's a real socket for that, but I dont' know anyone who has one...

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 265K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

Similar Threads

  1. Rear Differential
    By Jarrett in forum GM Powertrain
    Replies: 1
    Last: 01-11-2010, 06:12 PM
  2. Rear differential
    By Adam47 in forum Lifted & Offroad Suspension
    Replies: 2
    Last: 12-13-2009, 01:09 PM
  3. synthetic in rear differential
    By 9191gmc in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 14
    Last: 07-06-2009, 09:22 AM
  4. Rear differential
    By silveradoguy87 in forum GM Powertrain
    Replies: 1
    Last: 02-10-2009, 12:43 PM
  5. Have I hurt the rear differential ?
    By ibmoses in forum GM Powertrain
    Replies: 4
    Last: 12-27-2008, 10:08 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts