Re: [syncronized] Diagnosis Please

[Jim Boyce <jboyce2@wvu.edu>]

Matt,

I agree with the others about the tire.  Try rotating the front to the back  and see if the noise changes location.
If that doesn't do it, I would also check for play in the driveshaft universal joint -- although this would be a much higher frequency thump.  Maybe also checked for warped rotors in the back?

Jim Boyce
86 QSW

Matthew Brenengen wrote:


> Okay folks, I am looking for your best diagnosis, or better yet, a BTDT.  My sister's '87 QSW with 90k mi. has a driveshaft or tranny/diff problem, I think.  Symptom: in a high speed (i.e. 45+mph) situation, with the gas off, there is a rhythmic thumping
>
> It has been getting progressively worse, and she is worried.
>
> Any thoughts?  TIA
>
> Matthew Brenengen
> '87 4kq; '88 QSW; '76 '02
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