Ok I just had my tranny rebuilt. My problem was a busted 3-4 clutch hub. So I had that and the 3-4 clutches, band and all seals replaced. The other parts and tc was fine bc no metal and the tranny had recently been rebuilt prior. Ok everything was workin fine until I would put in rev and it would shift real hard by puttin it in reverse. Ok I cheked the codes and code p0785 I think came up. Which means "shift timing solenoid malfunction". Any suggestions of wat this problem may be? The guy said its got to be somethin else bc I had a secondary air code also. Oh yea. I erased code the first time it came up and it shifted fine. Well two days later it popped up and erasing code isn't helpin