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Drivetrain - 2001 - 2010 Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. First through fourth generation...

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Old 08-06-2019, 03:02 PM   #1 (permalink)
Chris27
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LBZ Spider Gears Worn

I've been chasing a vibration for over a year now. On the weekend I put the truck on jack stands and ran it up to the speed where it vibrates. Pulled the wheels, no change. U-joints are good, actually replaced the aluminum driveshaft last year with a steel driveshaft because the aluminum yoke was worn letting the U-joint caps spin in the yoke. Checked all the U-joints again, all smooth and free. Then I drained the diff and pulled the cover. there seemed to be a lot of play in the gears, what I found out was the play was in the spider gears. Ring and pinion look good, a bit of backlash, but not abnormal for 190,000 miles. Would worn spider gears cause a vibration? I would expect a clunk when the slack is taken up, but not a vibration. It only vibrates when on the throttle, loaded or unloaded doesn't matter. Is this common with the G80?

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Old 08-07-2019, 11:41 AM   #2 (permalink)
Chris27
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I think I've got it figured. I put the truck up on jack stands and had my wife run the truck up to speed. The harmonic dampener on the pinion yolk has a bit of a wobble to it. I'm guessing that's where my vibration is coming from. Has anyone ever just cut the ring off to see if it made a difference? I'm thinking of trying that first, I have to replace the pinion yolk anyways.

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Old 08-07-2019, 04:47 PM   #3 (permalink)
Chris27
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I found a complete rear diff from a 2011 Duramax for a good price. Has anyone swapped a 2011 or newer rear into an older truck? It looks like I should be able to swap my hubs onto the newer axle to keep my bolt pattern. Has anyone done this? The internal parts are the same, just not sure about the hubs interchanging. Swapping the complete rear would be easier, but I could also use the carrier and pinion yoke to fix mine. Local wrecker has a 2006 complete rear, but they want over double what I can get this 2011 rear for. Just wanted to know if it's an easy swap.
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