You might check out the 3rd generation Camaro diffs. (5 on 4-3/4 bolt pattern, 62" wheel mounting surface to mounting surface) I'm running an 1988 3.42 from behind a 2.8L V6 with a .72 T5 from an S10. The most common ratios are 3.08 and 3.42 with an occasional 3.73.

Being a coil spring diff you have to scrub off all the unnecessary brackets and weld on new spring perches (1-3/4 trailer perches from Tractor supply). The axle tubes are 2-5/8 so it's a good idea to use a piece of 1/8 x 1" flat stock as a shim if you're going to use 3" U-bolts. The stock emergency brake cables can be tied into the AD emergency brakes so try to save them. The Camaro rear sway bar is a perfect fit (39" eye to eye) when mounted on top of the diff with the control links forward of the diff. The IROC-z Australian made Borg Warner diffs are posi/discs, primarily in 3.08 but the axle seals are not available from GM dealers. Never did find any aftermarket seals. Posi/disc is tempting but be forewarned.

Although these diffs require a bit more prep to get them set up for the AD truck, I've found they are for the most part, in pretty good shape with lower mileage, readily available and normally $100.-$150.00.

With a 3-1/2 to 4" backspaced rim they will center in the AD wheelwell. Check out the install pics in my webshots album. Hope this helps.

Dave

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EXPERIENCE is the best teacher...but it gives the test first...and the lesson afterwards.

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