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Hello! I recently purchased a 2000 Chevrolet Silverado z71. When driving it has an intermittent vibration which seems to come from the front end. At 45 mph it begins. it starts low and builds till the dash and mirrors are shaking it is pretty loud. This happens every few seconds while pressing the gas if I let of the vibration stops. I replaced one front hub assembly but this didn’t help. Any suggestions
 

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2000 Silverado Z71 4x4 5.3L 460k+ miles w/ GM rebuilt motor and trans
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Check your front driveshaft u-joints (~40mph for me, same truck) and engine mounts.

Edit: Your front shaft is continuously turning, even when in 2WD.
 

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Discussion Starter #4
I checked the front drive shaft seems pretty tight. Took it down the road check engine light came on. Says that solenoid A performance/stuck.
 
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