[6pack] Rear wheels 'appear' to vibrate

[im sloane]

Hi guys,
Anybody have a guess or two to what this sounds like? When observing the
vehicle start off from stopped, the rear wheels seem to jump a little bit,
sort of a jiggle for the first revolution or so. We put the rear on jack
stands and let it run in 1st and reverse, and everything seems smooth enough,
no noticable wobble. It just 'looks' funny when you take off. One U-joint was
recentally replaced and the others seemed OK on inspection.

Sloane :)
69-Six.
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