I am not a transmission guru,
my lessons have been learned the hardway.
I put a 429 c6 auto into a 59 ford f100 in 1977
First thing I did was did'nt line up the pump with the torque converter and broke the ear off tranny. only needed a 1/4 of an inch so tried to force it in.
Pulled back apart and lined it up .
in 1986 I helped my brother change his engine in a 78 f150. he decided to replace the seal on the pump of the tranny.
we unbolted the circle of bolts, guts fell to the ground! did I mention it was 10 degrees and snowing?
So tranny 101 commenced and we got that thing back together.
Fast forward to 1999, hepled my friend put in his aod into his 66 bronco.
told him he would'nt need kick down cable, did'nt know it was what they call a tv cable for setting pressure. we fried the clutches...took out tranny, stood it up and changed the welded clutches.then reinstalled and hooked up the tv cable.
that aod was a pos. now its running a zf 5speed.
did you line up the torque converter to the pump? I'm not far from you I live in Elko..
Currently own that 66 bronco....