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I run a solid mounted engine plate with the spool style factory rubber tranny mount. I have run that same setup on several other cars over the last 25 years with good luck but maybe this time is different. U-joints didn't seem overly tight but I will recheck. The yoke wouldn't be able to bottom out but it ended up hanging out about 3/4" more than I would have like it to be when the car is at rest, so maybe it slipped a little to far out and caused the problem. Wouldn't it slip out of the tranny more on decel and into the tranny on excelleration?



It will and can travel either direction equally! under accell it will try to push the shaft into the trans, under de accell it will pull it out, depending on the 'roll' of the suspension .
I would look at the balance, and see how straight the shaft is,, I had a new shaft and it was bent , got it from a drive shaft co out of Florida, never got in because I checked it out, !