Posted by Allan In NE on December 04, 2010 at 04:00:08 from (148.66.88.254):
In Reply to: O.T. Chevy vibration posted by TOM IN FL on December 03, 2010 at 20:48:30:
Hey!
That's a good way to describe that symptom....."buzzy".
I never could come up with a word that would convey the difference between slower wheel/tire/road vibration and the irritating, faster drive train vibration. Thanks! :>)
Anyway, put the transmission in neutral and bring 'er up to the problematic engine speed; just to rule out the dampener, flywheel, clutch hub/fan/belt/tensioner, converter, etc.
If all is well and smooth as a baby's butt, you can just about bet that the vibration is still coming from that drive shaft.
Pull the drive shaft completely out of the truck 'cause ya can't find the problem with it mounted in place.
Usually (but not always) the rear-most u-joint is loose or is TOO TIGHT, middle u-joint, slip yoke dry/stuck or wobbled out, front u-joint, a bent or damaged shaft tube.
Again, check for a u-joint that is too darned tight as they need to rotate properly or they will vibrate with speed.
Make sure there is no lateral movement in the pinion yoke at the differential.
Oh, and I've never, ever seen a carrier bearing/mount cause a vibration, no matter their condition. The rubber can be completely gone to the point of the shaft screeching metal against metal and still they don't vibrate.
Problem could still be transfer case/front shaft, but the chances of that are just about slim and none.
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