Rolls forward in neutral, locks up rolling backwards??

The usual procedure to r and r the pump is to tighten the band onto the drum to hold everything in place when the pump comes out. But not doing that allows the forward drum and direct drum to flop around. Thrust washers can drop down and rings might not slide back into where they're supposed to go. Clutches aren't lined up anymore sometimes. What was the endplay like when you got the pump back in?