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1999 GMC Yukon Driveshaft U-Joint Broke

1999 GMC YUKON
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WNAGI1
  • MEMBER
  • 1 POST
A few days ago my 1999 GMC Yukon 4x4 (140k miles) started shaking really badly when I hit about 30mph. I pulled over and checked the car out as best as could. I thought it might be water in the tank, so I poured in some gas additive and rev'd the engine a few times. All of a sudden I hear a "clunk" underneath my truck. I looked down and saw back end of the drive shaft laying on the ground.

It looks like a U-joint just broke off from the rear wachamacall-it. Is that something that can be fixed, or am I going to have to shell out big bucks for a whole new driveshaft? I appreciate any and all advice.
Apr 15, 2006 at 1:27 PM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
You broke the U-joint. Hopefully you didn't damage the yoke on the rear end or the end of the drive shaft. If it need to be replaced get one from a salvage yard. Some of those shafts are fiberglass and they will fracture under such conditions. Look under and see what damage you have caused. If you don't have a support joint, pull the shaft from the tranny and examine it. If you have a middle support unbolt it from the cross memeber and drop the shaft. Good Luck Let me know!
Apr 15, 2006 at 1:37 PM
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Suggested Repair

Inspect the rear yoke and driveshaft end for damage. Replace the broken U-joint if those parts are intact. If the shaft is damaged—some are fiberglass and can fracture—replace it, possibly from a salvage yard. Drop the shaft to examine it: unbolt a center support if equipped, or pull the shaft from the transmission if there is no support.

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Conversation Summary

The owner of a 1999 GMC Yukon 4x4 reported severe shaking around 30 mph, then a clunk, and found the rear of the driveshaft on the ground after a U-joint separated. The expert said the U-joint broke and advised checking the rear yoke and shaft end for damage, noting some shafts are fiberglass and can fracture. They recommended dropping the shaft for inspection and sourcing a replacement from a salvage yard if needed.

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