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Speculations... (since it isn't engine speed or specific-gear dependent)
In addition to Red's suggestion...
Tire wear
Driveshaft out-of-balance
How's the rear diff gear oil?
Have you tried the 4-wheel drive engage/disengage?
Any more info on the problem -- does it do it in neutral, things like that?
RH77
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Supporting those devastated by the Joplin Tornado
EF5 / 22-May-2011
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