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why would you NOT use friction modifier on a limited slip rear?
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Gm has determined it is not necessary with this lubercant
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The part # they sold me is 89021677 - sounds like the wrong stuff @%$#^@$. Is that rear end pretty bullet proof, or are they prone to doing this. I figured new fluid should fix the problem. I do a moderate amount of towing, about 3-4 trips a year. I'll go back & get them to straighten this out. THanks.
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Sounds like it.
Those differentials are fairly bullet proof.
When I service a differential, after draining the fluid (cover off) I clean the inside of the diff with some brake cleaner to remove any old dirt that may be still there.
After I fill the diff, I drive it a nd immediately do 3 or 4 turns (usually in a circle one way then the other) to work the lube into the clutch packs