GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 6 of 6

Thread: rear diff fluid

  1. #1

    Default rear diff fluid

    i want to change my fluid but im not sure how could anyone tell me how i would be able to do this

  2. #2
    Sr. Engineer
    Join Date
    May 2009
    Location
    Manitowoc, WI
    Posts
    400

    Default

    My last 3 trucks were like this, not sure what year yours is but its probably the same.

    The drain plug is on the bottom of the rear differential, it has a square hole in it so just take a 3/8" ratchet wrench without any socket on it and stick it in the hole to remove the drain plug. There should be a fill plug on the back side of the case that comes out the same way. After all the old fluid is drained, put the bottom plug back in and fill it up from the top hole until the fluid is filled up to that hole. Replace the plug and you're done.

    You'll have to check your manual for what fluid to use, I believe I used 75W90 in my half ton and 75w140 in the 2500hd. If you have a limited slip rear differential (real limited slip, not just the G80 locker) you will need an extra bottle of additive for it to work properly too.

    Filling it will be a real pain in the ass too, I found taking down the spare tire made it a lot easier to get a funnel in there. Or maybe a little hand pump to fill it up would work good too.

  3. #3

    Default

    If you have a 10-bolt rear (10 rear diff cover bolts) you have to remove the diff cover to drain the fluid. Get a new gasket for it and reinstall the cover. On the passenger side of the pinion near the top will be a 3/8 or 1/2 square-drive plug. Pull it with just a bare ratchet of the appropriate size (well, it's close enough, just make sure you're in the hole all the way) and then fill the diff until the fluid level is even with the bottom edge of the fill plug.
    Christopher

    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

  4. #4

    Default

    ya i have a 96 sivlerado with the 10 bolt rear and from looking at it im going to have to take my covor off

  5. #5

    Default

    Make sure you can get the fill plug out first. You don't want to drain the diff, and not be able to fill it back up.
    When you hear hoofbeats, look for horses not zebras.

  6. #6

    Default

    Quote Originally Posted by 2COR517 View Post
    Make sure you can get the fill plug out first. You don't want to drain the diff, and not be able to fill it back up.
    A very good point that has slowed down more than one r/r diff fluid change.

Similar Threads

  1. How do I change the fluid in my transfer case and diff?
    By blackrat in forum General Chevy & GM Tech Questions
    Replies: 9
    Last Post: 06-09-2010, 08:09 PM
  2. Would you change it, or would you leave it? Rear diff fluid
    By zuper8 in forum General Chevy & GM Tech Questions
    Replies: 13
    Last Post: 05-13-2010, 07:21 AM
  3. Front & Rear Diff and Transfer Case Fluid Change
    By al96chev in forum General Chevy & GM Tech Questions
    Replies: 1
    Last Post: 11-24-2009, 11:12 PM
  4. 06 1500 - Diff Fluid Questions
    By brtt485 in forum General Chevy & GM Tech Questions
    Replies: 4
    Last Post: 11-12-2009, 10:22 AM
  5. question about rear diff fluid change
    By parks31 in forum GM Powertrain
    Replies: 7
    Last Post: 02-15-2008, 03:04 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
  •