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2000 Silverado Z71 4x4 5.3L 480k+ miles w/ GM rebuilt motor and trans
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Front driveshaft on this model spins at all times, even in 2wd. This is usually what I find is the problem when I get a vibration around 40mph, even if the U-joints seem alright.

I recommend dropping the front shaft to examine the u-joints. My last round with this problem, I thought they were alright until I pulled them. No slop. No noise. Pulled them and the front one was shot.
 
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