75w90 and no synthetics with an Auburn, they require petroleum oils only with a friction modifier additive that will come with the diff.
75w90 and no synthetics with an Auburn, they require petroleum oils only with a friction modifier additive that will come with the diff.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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