Posted by Bob on February 27, 2020 at 14:10:52 from (64.255.159.199):
In Reply to: Chevy Question posted by Howard H. on February 27, 2020 at 13:45:22:
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I always mark the driveshaft itself and the yoke at the differential, and install with the marks lined up. Perhaps not necessary, but doesn't cost anything, and rules that out as a cause of vibration.
More importantly, did you mark the front yoke and the driveshaft and match the marks when you installed the new U-joint cross?
The driveshafts are dynamically balanced as a unit and not keeping the individual parts in the factory orientation can cause a vibration.
As can bending an "ear" on one of the yokes, getting too rough removing the old U-joint cups, or having needles get lost or out of place.
Did the new joints move freely through what would be their typical range of motion without binding?
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