Bob,
That little gizmo is a harmonic (vibration) damper (actually damper is a bad
term, the addition of mass moves some resonance to a lower frequency where it
doesn't correspond with some other mechanical resonance, it doesn't actually
dissapate any energy) that fits over the very end of non-OD TR4 trannies.
It clamps over the aluminum trannie tailpiece, and does not attach, or
rotate, with the drive shaft. It is a royal pain to put on while both
the trannie and trannie cover are in the car.
I've run TR4s with, and without it. Haven't noticed a difference. I
originally thought some huge vibration would destroy the drive train, or
rattle my teeth out, but neither happened. I did put the piece back on
CT2966L when we rebuilt the drivetrain.
Bruce Clough
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