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Sounds like the hubs are having issues. Have you tried rebuilding them? It is not very difficult. First try driving a little with just one hub locked. Then the other. Does it vibrate with only one and not the other?
Also, (I doubt this part) but maybe your Detroit is starting to fail. Does the vibration change at all when cornering?
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'90 Extra cab V6 4x4 PU
5.29 gears. Detroit locker front, Detroit Truetrac rear.
35" BFG mudders. Trailmaster 4" susp, 3" body lifts. Add-a-leaf. K+N intake, 2.5" exhaust with Flowmaster 40 and a cat I got off an Evo VIII.
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