I'm running an 89 Camaro diff.....plenty of them in the salvage yards with 3.08, 3.42 and some 3.73 ratios. In fact, any of the 3rd generation Camaro diffs should be the same (62") mounting surface to mounting surface widths. In addition the Camaro sway bar can easily be adapted to work with the AD 39" frame. I just flipped the bottom mounted Camaro setup to the top of the diff, pointing to the front. The Camaro control links installed straight up and required a 3/8" hole on the bottom lip of the frame. The Camaro emergency brake cables tied in with the AD emergency brake setup with a couple cable clamps. Aside from having to scrub off all the coil spring mounting hardware the install was straightforward and most diffs were in the $100-150.00 range. As was pointed out, you need to ID your transmission final gearing,and tire diameter to insure you're going to be matching your R&P ratio. A typical 235 engine makes it's torque way down between 1500-2400 rpms.
BTW...the Camaro diffs are 5 lug on 4-3/4" pattern with plenty of aftermarket rims. I run 4" backspacing on 15X7 w/235/70/15 on the front and 15X8 with the same backspacing on the rear with 255/70/15 tires. With front discs, I have between 5/8-3/4" clearance between the tire sidewall and the tie rod ends and the rims are centered in the rear wheel wells.
Dave
