904 Transmission Stopped Going Into Gear

I read that you use a razor blade to clean up the bushing after it's installed on a regular basis. STOP! That's the wrong size bushing driver. It has to fit snug and have a large enough flange to put even pressure on the bushing. But I thought you said you were a machinist or repair person dealing with close tolerances etc... Don't accept that type of an installation. It's no good and it's inviting the bushing to spin if it is distorted. The 904 has no design flaws...no transmission does..it is what it is and we work with these parts accordingly. The proper method is to align the pump halves with an adjustable clamp. Just like a th350, th400, th200 and a few more. And don't even get me started on the A4LD and C3 and 5r55e.. And that's without the o-ring installed. And you still have to align the holes by turning the halves until they line up.