Ok, I dont know a thing about our trannys or how they work but I am a good friend of Ray Pampena. He is the creator of the 300M output shaft, well at least hes the one that had it made. I remember him telling me that its no simple task to re-create stock parts. Things like they we they are balanced, tolerances, and the whole engineering process behind it is what makes it difficult. Hence $600.00 for an output shaft. Ray has opened a shop and no longer works for mitsu so ill mention the idea tranny parts to him again or just let him know about this post.
On a side note:
A member of my club is in dire need of an input shaft bearing, can anyone help. Cant find the part anywhere.