It wasn't slipping and pulled in forward but had no reverse at all. It was losing fluid as fast as I could put it in. When I bought it, it had a funnel in the dipstick and a pile of transmission fluid bottles in the bed
so I knew it was bad. The snap rings gaps were on the opposite side and they had put in some kind of additive that ate the rubber seals and fiber thrust washers. Some bolts were finger tight and some were so tight it just about stripped the threads, but the clutches look new in it but the both bands were toast. I bought it from the salvage so I didn't get to ask questions of the rebuilders on what they did.
I'm not a transmission guy but this is my third th400 rebuild and I have the book.