Any unusual sensations when up or downshifting when let clutch out, or does your quote of no shifting issues cover this?
Any shudder stsrting out in 2nd gear.
Assume transmission mount ok as you have removed it several times.
Does sound like plain old ordinary clutch chatter caused by defective clutch or flywheel surface or motor mounts. Pilot bearing fit of trans mainshaft ok?
What happens when in reverse? If nothing, would suspect again engine or transmission mounts
Don't suppose rear axle posi could cause this???
No issues up or down shifting.
No shudder with 2nd gear takeoff.
New tranny mount.
2 new pilot bushings. Only because I already had it apart and they are cheap.
No shake in reverse.
Dr diff says no on the posi and a contact from A bodies site has a 68 with the exact same problem. He rebuilt his posi. Did not fix.
I think I will chain down that left engine mount side and see what happens.