Quote:
Originally Posted by Trucker1967
Or perhaps some slighlty out of round bearings in the differential case or at axle ends or axles even being just slightly out of balance, perhaps this design is very sensative to harmonic frequencies in a certain range, once a bad freuqency starts it would spiral out of control until it is either under or above its most sensative harmonic range.
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I highly highly doubt that. As many people have stated, it does it on some roads and not others. You would have different issues from a bad bearing, axleshaft of gear set. noises and it would change frequency at speeds, yet still be there. It would also be on all vehicles with the same parts. Toyota would notice 100,000 vehicles with poor wheel bearings!