I found some issues today... with the help of Scott..
the pump support(stator support was the wrong size for
the input shaft rings... the input shaft is 1.175" and
the support ID is for a 1.240 input shaft... but I had
already planned to go back with all the stock components
from this trans.. so I might not have understood WHY it had
issues.. but measuring it I now think I know why... the input
shaft seal ring didnt come close to sealing.. and when the
sealed blew out I had enough pressure to roll forward but not
enough pressure for reverse.. it had enough pressure to barely
roll in forward... at least this is what I think.. all I did
on this trans was change the pump assm... but didnt know there
was 2 different input shaft sizes... now I am learning that
the early 518(non lock up) which was from 88-91 COULD have
either input shaft.. in 92 they went with the lock up conv
and they changed to the larger input with the hole down the
middle for the conv.... still learning... anyways.. I put it
back together today with the original stock pump.. plus Scott
informed me he thought I had to have the output shaft on to
measure input in play.. he was right.. now I'm on the low end
of the spec.. which will be fine...tomorrow I will sit down
and go through the valve body step by step to clean it.. the
conv goes out Monday