Quote:
Originally Posted by phoenix_iii
Had some work done on my newly acquired 85.5, I've put less than 200 miles on it since owning it (mostly to transport it). Anyway, car drives well now (tbelt,pump,balance, etc), but I get really bad vibration (hear it and really *feel* it right in the shift knob) right at 3900-4050 rpm. Just that range, then feels smooth from then on, or before it.
It also does this with the car NOT in gear (in neutral), so I do not think it's anything with the drivetrain.
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Maybe similar to out of balance wheel but not to the extent of more vibration at higher speed or rpm. A poor rubber clutch disk usually vibrates at a specific rpm and may not be vibrating at a lower or higher rpm.
"Hear it and really *feel* it right in the shift knob" again for me points to the clutch out of balance.
I do not think it is the drive shaft bearings, but maybe with the transmission in neutral and engine at 3900-4050 rpm, you could test if the vibration occurs with and without the clutch engaged. Please be careful...set your emergency brake.
John_AZ