A904 front pump install problems 63 Dart GT

hey thanks for all the help and advise on this issue! well, I'm sorry to say I've tried all of those things mentioned above. The trans is suspended securely, tailshaft pointing down. everything looks seated correctly, the planetary gear train can't go down any further against the one way clutch bearing surface and the clutch packs are seated as far as they can go. I've taken out the clutch packs and checked for damage, there is none. Seems to be a clearance issue going on with the washer between the rear clutch pack and the planetary gear train. this is a small nylon washer about 1" dia. when I leave it out the pump installs fine with bolts snugged down (not torqued fully) I can then turn the output shaft by hand as well as the input shaft but it's really tight. and there's way too much end play going on so the washer has to be there.

I don't what I did to throw this thing so out of wack by just changing out the frictions and bands.