This subject may have been discussed many many times before, so this should be no prob for you guys...i know on the tranny i need the B&M adapter thing for the torque arm, and a driveshaft from an 82 4 speed or sumthin like that if i get the 6" tail...but will i need new tranny mount(crossmember i think its called? maybe, i dunno) if one of yall could explain what all i will need, i would GREATLY appreciate it, thanks guys!!!

 

Since the frame rails to which the rear crossmember mounts are not parallel, changing the length of the transmission requires a different length crossmember.

A 6-inch tailshaft TH350 would require a shorter crossmember than a TH700R4.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).