Dan,
The images below were pulled from a
Tech Article written mostly by Marcesq. I used this article quite a bit when doing my rebuild. It was pretty informative.
Drawing from Marcesq
There are 3 detentes, 2 Horizontal (Green arrow shows lower of 2) and 1 vertical (Blue arrow). Make sure the vertical one is between the 2 shift rod holes and that the 2 horizontal ones are pushed back into their bores.
This is a pic from I was working mine showing how the detent slipped from between the two shift rod holes. It MUST go in the bore that runs BETWEEN the holes.
Hope this helps!
Randy