Terrible vibration between 72-77mph

Maintenance/Repairs
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1

Hello. Vehicle in question is a 2007 GMC Yukon XL 4x4 5.3

I recently did work on my truck and now there’s a terrible vibration (not to be confused with a shake) at about 72mph-77mph. Outside of that range, it drives fine.

The work I did… replaced u-joints. While drive shaft was out I replaced rear seal on transfer case. During the process of replacing seal, I noticed transfer case fluid was black so I drained and filled with new transfer case fluid. Replaced front right half shaft. This is all the work I did between the ‘before & after’ of the vibration.

Any feedback would great. Thanks for reading.

2

Did you replace the drive shaft back in the same orientation it was before if so it may be needed to taken shop to get balanced.

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3

Thanks for the reply. I did not mark the shaft unfortunately so it’s likely in a different position, however, I’ve read that with my truck it doesn’t matter. I may just remove it, rotate it and put it back in. See if that changes anything. But the vibration is only between 72-77mph which is odd.

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4

Does it happen if you leave it in d3? Overdrive issue?

5

It’s just in regular drive. Haven’t tried it in any other gear. I’ll try tomorrow. Thanks

6

couple of years back I replaced U-joints on my Pathfinder and I’ve got quite a bad vibration around 60-70 MPH

I removed the shaft and started re-checking everything, when I noticed that one of the cups was pressed in visually deeper than another when looking on it from the inside, on outside they were the same

I checked if stopper rings were properly installed and snug and if cups were pressed against rings, and they were

then I removed the joint and cups under question and measured them with a caliper, and it was something like 1 mm difference in their size, which is huge in the terms of precision needed there to balance properly

this join was also “overly stiff”, confirming the issue

U-joints were AC-Delco from RockAuto, not some garbage

I filed warranty case with RockAuto and they sent me replacement joint quite fast, after reassembly everything was just fine

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