A good guess would be the midshaft bearing. I've seen several go out, but when you crawl under the truck, they still feel really solid. Just if you seperate the 2 driveshafts make sure that you mark them so they go back together the same, if you don't you'll have a major vibration and ruin your new midshaft bearing. I learned that one the hard way.
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'69 CST Short fleetside
Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress)
'87 V10 4x4 Short Fleetside
Quad Suspension and Dual Tanks
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