904 question.

I think you should try it. there is not many special tools needed for a 904 and it is one of the most simple transmissions to rebuild. Its the first one that I had to rebuild. (for a roomate of mine. I knew if I didnt fix it, there would be endless bumming of rides, so I rebuilt it in the basement, I got a whole dinner out of it for a payment but it kept his 69 coronet on the road). Just be careful with the "pushbutton mechanism" as these are somewhat hard to find parts for. An old "MOTOR MANUAL" would be helpful for the pushbutton aspect and an ATSG rebuild instructions are available online im sure.