I'm running a MArk VIII in mine and it doesn't have Trac-Loc. From what I was told they all have open diff. unless it's from an LSC. They relied on Electronic Traction control(ABS,etc.)instead of some kind of mechanical traction control diff. I just put a Auburn Locker in mine. It has the grooves for the IRS half shafts.
Dan
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Dan FFR3222 460(w/Stacks)/TKO/IRS
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