sure glad I read this post on the 57 F350. Dan I'm having the same problem with the one I inherited,( 57 F350) it has 5:13's. I thought when John said he put a T85 in it, I didn't realize it was put between the 4 sd. and the rear itself. I was under the impression that the 4 sd. was taken out all together, and replaced with the T-85.  Also I'd Love to see Brian and Royce both at this years Nationals, that would be something.

                                                  Michael

Sparta , Tn.