Ummm, Those are part numbers for an Auburn Differential. If gears is what you need, the part number is M-4209-F373. All 8.8 rears take the same gear, whether it be 28 or 31 or whatever spline, whatever differential.
<font size=-1>[ This Message was edited by: 01GTB on 2001-09-01 16:02 ]</font>
OK, thanks for clueing me in on the part numbers. Does the Bullitt already have a limited slip in the rear diff? I had an Auburn limited slip diff in my last car's
rear end - a Ford Explorer modified for offroad, had 4:10 gears in it, borla exhaust etc.
It already has a Trac-Loc diff. As to your original question, is it 28 or 31? I couldn't answer that. I would assume it is a 28. But when buy gears it doesn't matter. If I were going to upgrade differentials however, I probably wouldn't choose an Auburn.
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