As I recall the conversation with the garage owner, his guy did identify
a missing hanger "insulator" and most of the vibration disappeared with
its replacement. Perhaps resonance in the exhaust was being transferred
to the driveline or more likely the floor pan as the shifter really
vibrated and now it does not. The vibration is now more heard than felt,
and at a much higher speed, so it's entirely possible that a bearing is
the culprit. I'll let everyone know the end of the story!
Thanks for responding.
Rick Norris
Sally or Dick Taylor wrote:
> Rick---It's seems unlikely that the driveshaft went out of balance, but
> since they agreed to fix it, it's on them. Sounds more like there's a
> bearing in the drivetrain that's starting to protest.
>
> It's good for exhaust pipe hangers to have some sort of rubber bushing
> or strap in the connections to the frame or body sheet metal. No matter,
> I can't imagine this would be the cause of the driveshaft to vibrate.
>
> Dick
>
> From:
> rnorris1@swbell.net(Rick Norris)
>
> I took my TR6 with a driveline vibration to a mechanic to get all that
> sorted out. What he found was that one of the exhaust hangers,
> presumably a front mid-pipe hanger, was improperly installed. He moved
> it around and most of the vibration is now gone. I did not have the
> opportunity to speak the fellow that actually did the work
>
> ...but, because there remains a bit of vibration at around 70mph which
> we all agree is likely the drive shaft needing to be balanced, I left it
> with them to do the really dirty work.
>
> So, my question; how in the world can a exhaust hanger or clamp cause
> the drive shaft to vibrate?
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