Inspection of a 904 torqueflite

Is there a process to get that low gear set bushing on straight. I went through several just messing with it. With the press, It wasn’t going to happen. I even broke a ring gear support pressing one in too hard. Lesson learned there. The only way it went on straight was
With the hammer and driver. A lot of the other bushings straighten themselves out, but not that one.

Then when it was finally in. The low gear set didn’t want to go through it. I tapped it through just to see what would happen. It finally broke through. Showing the low gear set itself had a high spot on the tip of the assembly. When it was through. It turned just fine but scored the bearing on the way in. Had to start all over again. I see that the shorter the bushing. The harder it is to get in straight. The reason I tapped it through was to see if it was the bushing or the gear set. I’ll have to file down the end of gear set race until it goes right in and replace the bushing.

So far. The 999 has given me the most issues. The 904 has gone pretty smooth but it was running in my car and the history was somewhat known.
No exact process to my knowledge either. I have only done a few.
I would use some kind of driver or a flat piece of wood. You are correct, the hardest part is to get it to start straight. I have found you need a heavy enough hammer too to get enough force to correct the slight crookedness of the bushing. A proper sized fitting bushing driver is best though. Cudafact may be able to better advise you here. As he would have more experience.