Rear diff covers and oil

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mnachreiner86

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When you check your Diff tag it will read either 3.55 (open) or 3L55 (Trac loc), or whatever gear set you have. Only need friction modifier it it's got the "L" for trac "Loc".

Or if your door tag has a letter next to the number under axle


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Aspen03

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2nd gen here but 3.73 LSD. The letter in the axle code is usually the dead giveaway like mentioned above. Mine is the H6. The 16 would be the open diff version of the 3.73 which came on the 2nd gen vehicles that have advance trac as the LSD was not an option with it. I have 4WD as well, that has basically no bearing on what rear end you may have.

The axle codes are different from one generation to the next. Quick Google will give you a comprehensive list of all available configurations.
 
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