I think the reason my driveshaft had to be changed was both the v6 and the 5 speed. The 5 speed is shorter than a 700R4 4L0E.
If I hadn't shortened it, I would have had to move the rear end back a few inches.
I figured it easier to shorten the shaft
'92 Fullsize, swb rc
5.3L/T56 conversion, comp XR275 HR cam .566/.568 lift 222/224 duration 112 lsa, crane dual springs, trick flow push rods, K&N Filter, Nelson Performance tune, Keisler shifter relocation kit, Boyd Coddington Smoothie II 18x8 235/55 up front, 18x10 295/45 out back, 2/4 drop, eaton lsd w/4.56 gears