You are correct, the main shaft and the tail housing are the only difference. I agree with 440, the 23 spline and 18 spine transmissions use the same mainshafts.

Now about that switching over from a classy B body to a lowly A body issue.... stirthepot laugh


[img]http://i.imgur.com/boeexFms.jpg[/img]
31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
"Wise men talk because they have something to say; fools because they have to say something. ~ Plato"