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  1. #1
    Sr. Apprentice
    Join Date
    Apr 2009
    Croton on Hudson NY

    Default Front diff gear oil

    Chilton says I need to use 80W90 GL5 Gear Oil in my front diff. Is there any reason to use or not use synthetic? Also I see they come in LSD and non-LSD versions. I assume non-LSD? When I did the rear I used synthetic LSD (I do have the locking rear which specd synthetic.)

    2001 Suburban 1500 4WD LSD

  2. #2


    I've used the Mobil 1 75/90 in my front and rear diffs. in all my trucks forever with no problems at all.

  3. #3


    I did front and rear diffs at the same time and just used mobil 1 75-90 synthetic LS in both. you dont need synthetic or ls up front but why not.
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  4. #4
    Sr. Apprentice
    Join Date
    Apr 2009
    Croton on Hudson NY


    What's the fluid capacity of the front diff.?

  5. #5

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