Output shaft bent on a 904

You do realize that you have to completely disassemble the trans. to replace the output shaft cause it goes in from the front, right?

What makes you think the output shaft is bent? If the output shaft were bent I can't see how it woulndn't break the extension housing cause when you slide the driveshaft yoke in it's a tight fit into the bushing. Is the bushing on the extension housing all beat to crap? How about the bearing on the output shaft.

When you said you replaced the driveshaft and it (being the vibration) returned do you mean it was gone for a while then returned or you actually saying it never really left, that it was still there after you replaced the driveshaft??