Drain the converter and look way inside at the splines that the input shaft engages into. Just replaced a converter in a customers car yesterday for that reason, sheared splines. Have seen alot of 904's with busted hubs too. Ya, a 904 or a C4 (ford) can be made to take abuse, but they are no 727 or C6. Anyone I've ever known with a hard driven 904 got it refreshed on a regular basis.

Don.