Quote:

I would not even be thinking about the floor pans etc. An old engineering manager of mine would call that "chasing ghosts". The answer is somewhere in your previous post.

The vibration appears after installing the clutch assembly and transmission, OK that would indicate to me the vibration was due to
1. something in the clutch assembly.
2. A problem with the bell housing itself
3. The transmission.

Another thing to keep in mind is, we don't know that the vibration caused the failure only that it was there before. the 40 year old bell housing may have been fractured due to being dropped and it was not apparent.
I have seen 2 very similar failures (almost identical) both were caused by an incorrect bearing retainer OD to Bell housing ID.



Not to highjack the post, but i bought one of those converter rings to put on my bearing retatiner from brewers. Has there ever been any instances of them falling off and ending up in the clutch? It's got me kind of worried.