For a auto you cant really go wrong with either rear. I do know there are issues with I believe the Moser 12 bolts tq arm mounting bolts. The factory 10bolt and 9 inch use the 2 long thru bolts to mount the tq arm to the rear. The 12 uses 4 small screw in style bolts that have a tendency of backing out. See the link
http://ls1tech.com/forums/suspension...arm-bolts.html
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2000 SS Th350, FTI 4200 stall , cam, full bolt-ons, 150 wetshot, Moser 9inch/locker/4.11s, Slowhawk tuned. 493rwhp 570rwtq. 10.97 @ 127.7 1.58 60' and M6
10.84 @ 126.3 1.55 60' Th350 SOLD BUT NOT FORGOTTEN
New Toy - 06 Torrid Red Gto M6. 231/242 cam, Kooks, magnaflow, GForce, Monster stg2, lingenfelter cai, 411rwhp 385rwtq. 12.40@111
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