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new truck, new fluids

Discussion in 'Chevy Truck Talk & GM News' started by JohnnyZJ, Jul 20, 2012.

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  1. JohnnyZJ

    JohnnyZJ New Member

    so as per any new 'used' vehicle i buy, i think its wise to swap all fluids, just wanted to verify with y'all as this is my first GM.

    trucks 4x4, auto 5.3L with the auto4wd option.

    so heres what i've found and wanna verify

    motor oil: 5w30 is ok?
    tranny: dextron VI
    tcase: auto track crud from stealership
    front diff 80w90 or 75x90 synthetic
    rear diff 75x90 synthetic

    going to do motor, diffs and tcase this weekend. tranny maybe next. (dropping the pan for the filters a pain)
    was also wondering if i can run 80w90 in the diffs. rear looks like a 10bolt, and i don't think it has any traction aides.

    thanks :)

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