HELP! 727 driveshaft problem

How many splines do you count in the slip yoke(s)? Did you buy or build this transmission? Is it possible one (or more) of the splines on the output shaft are damaged, not allowing the slip yoke to slide over?

IIRC the 727 output shaft has 30 splines, and the 904 has 27. The front carrier splines have changed three times over the years, however.

EDIT: I should have also included that the number of splines IN the slip yoke is ONE less then the number of splines on the shaft. So 29 in the yoke for 727, and 26 for 904. Hope this helps! Let us know what you find!

Chris