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Originally Posted by lussenden
my 1990's rear diff has a tag on it that says to use only limited slip oil only. i read somewhere that they came factory with detroit track-lock limited slips. does mine have that?
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It sounds like you do have a Trac Lok limited slip. You have to add a friction modifier to the gear oil so the clutches will grab correctly.
BTW, Detroit doesnt make Trac Lok, Dana does.