I just rebuilt a big block 727.
Lots of good new parts, billet internals, manual valve body with low band apply, 4500 stall converter

Just did the initial start and check to see if the wheels move when put into respective gear.
Reverse works
Neutral has slight forward movement but I can stop the wheels by hand.
Low and other gears seems to go as they should-

This is on Jack stands


When I put it in reverse from being in gear it stays as forward. If I shift it to reverse from park is goes in reverse. Has done this several times- i checked and re adjusted the shift linkage and that is correct.

Why would reverse be forward only if shifting from forward gears??????
Shifted to reverse from park it is reverse!?!?!??

Thoughts?