need a bit of help...

Probably an 8 1/4,...8 3/4 diffs bolts are in the front,(toward the front of the car), no cover,.....3.55 is a common ratio for a 8 1/4,..this is whats in my jeep, and it is a limited slip (posi),...be careful mixin and matchin axle's,...do homework and measure,...I'm sure some of the other members here, can help ya a bit more,...rear diffs are not my "forte".....pics would help your cause...good luck.