Vibrates only when letting off the gas

[KyleH]

I have a 2007 GMC Yukon Denali. Everything is stock. 90,000 miles. Tires are about 50%, brakes are good, alignment is good.

When I'm traveling above 60mph and let off the gas it vibrates hard... just like going over rumble bars. It has that feel but not quite as much noise. This is the only time it happens.

Not sure where to start... tires, wheels, alignment, transmission, u-joints, torque converter, driveshaft, etc.

Any ideas? Thank you.

 

[icanresqu]

You may want to look at the universal joints. As long as you are cruising or putting pressure on the joint it will usually not vibrate, but if you let off it will start jumping around causing a vibration. Hope this helps. Make sure you block the wheels and apply the parking brake before you get under it to try and move them around. If you can get access to a lift it will make the process a lot easier. Hope this helps.

 

[KyleH]

Looks like then u-joints checked out OK, any other ideas?