Automotive Forums

I have rebuilt this transmission and fitted it to car, problem is it doesn't drive in reverse( binds up)and moves forward in neutral and also you can feel it load up park.Trans was completely stripped and cleaned, clutches rebuilt, input/3rd sprag assembly checked and rotation checked according to shop manual, have pulled this trans a second time thinking the input drum assembly may have been cracked, replaced drum, rechecked and reinstalled but still same problem. There is something I am obviously missing and any help in pointing me in the right direction would be greatly appreciated.
Thanks