Just one contradiction (addition)? to Greg's very useful info...
You can buy urethane bushings that duplicate the same 'hardness' (resiliency,
consistency)? of the original rubber bushings...the most desirable advantage
being their longevity (read lifespan) compared to rubber. This being said,
The urethane bushings should transmit the same amount of noise and vibration
that Greg addresses. On the other hand, the harder versions in urethane will
indeed transmit more noise and vibration. They are far more impervious to all
elements that 'attack' them and ultimately cause their degradation.
One often overlooked, neglected area of TR IRS suspension is the rear
differential mounts. More times that not over these car's 30+ year lifespan the
original (or even replacement) rubber diff 'bushes' have been allowed to 'live'
too
long with the ultimate evidence being the dreaded "rear end clunking noise"
which is most likely caused by cracks that have developed from metal fatigue
where the mounting bolts meet the frame cross-members. Once the resiliency of
the rubber diff mounts is gone, all (or most) of any impact transmitting
through this area of the rear suspension goes right to the bolts and their
mounting
points. It would be prudent to check these points when refreshing the diff
mounting bushes.
FWIW
Larry M
CD5182L
PS...I bought my urethane bushings (all in the standard hardness which
duplicates the original rubber) from a company in England called Polybush. You
can
view their site at <A HREF="www.polybush.co.uk">www.polybush.co.uk</A>
NO financial interest etc. Just a satisfied customer!
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