What's broke?

Some random thoughts......

Look CAREFULLY for ANYTHING touching the car body/ crossmemeber/ broken steel on steel mount, etc. "Transmitting noise."

WHAT DO YOU have for a shifter ball / handle.......Decades ago a friend of mine had an ANNOYING noise from a cue ball shift knob, as did I, evidently caused by the air cavity due to a deep hole

In my cause this problem (with the ball) assisted in some EXPENSIVE repairs to my 69 RR 383 4 speed, "what happened"

Me, inexperienced, made this cue ball shift knob, as did my friend. Noisy. Unknown to me, the big rear ball bearing was failing, pitted balls and race, noisy, gaining play in the thrust, and later BREAKING APART as the balls left the bearing

This cause damage to a tooth on the cluster and a ruined tooth on the pinion (main drive gear.) It also, because the mainshaft now was walking fore/ aftt, damaged the nose of the main shaft

I let a machine shop talk me into putting a "hardened collar, better than new" on the main shaft, replaced the main drive gear, and gambled on the cluster, with a small chip in a tooth.

It came apart again!!

That time it needed a cluster, ANOTHER main drive gear, and the mainshaft collar repair was failing, so a new mainshaft. I believe I had the gearbox out of that thing 4 times.