Chris,
I had the exact same vibration a couple months ago. I changed the u-joints
and the vibration disappeared.
Scott McKorkle
1978 MGB
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> From: Chris Kotting <ckotting@iwaynet.net>
> To: 'spridgets@autox.team.net'; 'mgs@autox.team.net'
> Subject: Odd Vibration
> Date: Monday, October 19, 1998 8:20 AM
>
> I'm seeking the wisdom of the list in efficiently tracking down a new
> vibration in my '77 Midget.
>
> This weekend, we noticed an odd vibration with the following
> characteristics:
>
> 1) Only present when drivetrain is under load (Coasting in neutral, no
> vibration. Engine speed matched to car speed, no vibration. Braking, no
> vibration. Accelerating, vibration. Engine braking, vibration.)
> 2) Rate is relative to road speed rather than engine speed, but seems
> slower than wheel rotation rate.
>
> I'm currently suspecting either: (A) a u-joint in the driveshaft is
> binding, or (B) the rear transmission mounts have gone bad.
>
> Any thoughts?
>
> Thanks
>
> Chris Kotting
> ckotting@iwaynet.net
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