David,

Is it possible for you to measure the wear mark on the RD1-X drive input shaft splines to see if there is any indication that the RD1-X adapter plate has moved in a forward/back linear fashion?  If there is, then wherever that is coming from is the problem.  It is either flex in the flex plate, or end play in the input shaft.

Everybody is trying to fix flex in the flexplate, but I don’t think we have definitely ruled out end play in the input shaft yet.

Bill B