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  1. #1
    Master Mechanic
    Join Date
    Apr 2009
    Location
    Owens Cross Roads, Alabama
    Posts
    634

    Default front & rear diff. & transfer case fluids

    i figure its about time i check and/or replace the fluids in my front and rear differentials as well as the transfer case.but....i have no idea what im looking for or where to begin.anybody had experience on this?what fluids do i need?where can i get em?and how much of a task am i lookin at here?
    -Dylan
    2004 Silverado 4x4
    4.8L
    1986 K5 Blazer
    8" Superlift w/39.5 super swampers
    1992 GMC Jimmy "Blue Bomber"
    4.3L Vortec

  2. #2

    Default

    The good news is all 3 units take 75-90 Synthetic Gear Lube. The front diff and transfer case have a drain plug which is easy. The rear diff requires R&R of the cover. Just buy a tube of High Temp Black Silicone Sealer for the rear diff. Make sure to scrape all the old gasket off the cover and diff housing. Put a rag over the gears so you won't get crap inside while scraping. Clean both surfaces with brake cleaner and run a big bead of sealer around the cover. Install the cover and let it dry for about an hour. You don't have to wait a whole hour but it won't hurt to let it set up before adding oil.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3

    Default

    I forgot to mention you will need a shade over 5 quarts of lube so buy 6 to be safe.

  4. #4

    Default

    The front and rear differentals I put in MOBIL1 synthetic gear oil. You can buy it at any car parts store like NAPA. There are 2 plugs in the diff. 1 on the bottom(drain) and 1 up above the halfway point in the diff (fill hole). It drains faster if you take them both out. As for the transfer case Its very similar as it also has 2 plugs which you use the same way.If you decide to go with synthetic in the diff's then you might want to put synthetic in the transfer case as well.
    Don-Rhode Island
    2006 Silverado 2500HD 4X4 (68,000 miles)
    2005 TrailCruiser 5th wheel camper

  5. #5

    Cool front & rear diff. & transfer case fluids

    Hey Jimmlee, doesnt it depend on the transfercase you have. I have a 246 and was told to use the auto-trak ll fluid. I do use Mobil 1 in the diffs. Can you use Mobil 1 in the 246 case??? Thanks.

  6. #6

    Default

    Are you sure that your rear diff. doesn't have a drain plug? Even the rear diff. usually has a drain plug.

  7. #7

    Default

    My transfer case requires DEXRON VI in the 2006 silverado.

  8. #8
    Master Mechanic
    Join Date
    Apr 2009
    Location
    Owens Cross Roads, Alabama
    Posts
    634

    Default

    Quote Originally Posted by Jimmiee View Post
    The good news is all 3 units take 75-90 Synthetic Gear Lube. The front diff and transfer case have a drain plug which is easy. The rear diff requires R&R of the cover. Just buy a tube of High Temp Black Silicone Sealer for the rear diff. Make sure to scrape all the old gasket off the cover and diff housing. Put a rag over the gears so you won't get crap inside while scraping. Clean both surfaces with brake cleaner and run a big bead of sealer around the cover. Install the cover and let it dry for about an hour. You don't have to wait a whole hour but it won't hurt to let it set up before adding oil.
    thanks jimmiee very helpful.ill try to get that done this weekend and let you know how it went

  9. #9

    Default

    if you have push button 4wd switch it takes auto track 2

    2003 Z71 Silverado LS
    Access roll up cover
    Bed Rails
    Billet Grill insert
    Bed Rug
    CB with PA system
    Waiting to be installed
    Two 8in RF HX2 punch( would have 12s but they got stolen)

  10. #10

    Default

    Good point. There's more than one transfer case option

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