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  1. #1

    Default One More Rear End Question

    The shop has started rebuilding my rear end. It's a 2002 1500 Surburban with limited slip differential. They are going to add the GM additive (GM PN 1052358) before I pick up the rear end. Their salesman said that with this additive, I didn't need to use 75W-90 synthetic oil, but could use any name brand 75W-90 oil which complied with GL5 specs.

    GM recommends synthetic oil in the owner's manual, but makes no mention of the additive.

    If I have the additive, do I need to use synthetic gear lube?

    Thanks.

  2. #2

    Default

    If you have the G80 you don't need any additive. The easy way to tell is jack up your rear end with the trans in park.E Brake off. If you can turn one wheel and the other turns backwards you do not need any additive. If you can't turn one wheel or the other in park you need an additive. All rear diffs can use synthetic fluid. It is more expensive and worth the extra cost.
    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
    Sr. Apprentice LURCH's Avatar
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    Default

    X 2 !!!!!!!!

  4. #4

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    What they said
    David
    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.
    http://www.gmtruckclub.com/forum/sho...Silverado-2500
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  5. #5

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    Let me put it another way. I think they may have already finished the rear end rebuild. If they have, they have probably squirted the additive in the rear end. The question now is will the additive do any harm with synthetic gear oil?

  6. #6
    Sr. Apprentice LURCH's Avatar
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    Default

    I use it with my Amsoil syn. 75/90.

  7. #7

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    Quote Originally Posted by Tom Evans View Post
    Let me put it another way. I think they may have already finished the rear end rebuild. If they have, they have probably squirted the additive in the rear end. The question now is will the additive do any harm with synthetic gear oil?
    No it wont do any harm
    David
    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.
    http://www.gmtruckclub.com/forum/sho...Silverado-2500
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

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