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Originally Posted by BAA
OK, here's and update
Rotated tires - front to back, back to front
Test drive - same problem present. Shifted into N and no change in noise/vobration.
Shifted from O to 3 and no change in noise/vibration (enginer RPM did increase as expected).
Any further ideas will be appreciated
Bob in MI
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OK,, knocking it in N and pulling it down a gear changed your engine and tranny speed. The vibration stays the same which means its in the final drive somewhere. That leaves you drive shaft, rear axle, wheel bearings; anything after the trans.
You said this was a 4WD, what does it do in 4Hi on the street? Any change?
Do you have a camper shell on the bed? Do you have dual exhaust? Believe it or not I got a lot of "vibration" complaints that was from exhaust enhanced by a campershell. WE used to weld or hang led weights from the exhaust to dampen the resignation.
When you rotated the tires did you check wheel bearings? The front bearings are assemblies which have a tendency to wear fast once they start to wear.