Our 07 Burb has a slight vibration in it that almost feels like you hit the rumple strips on the highway, but much much lighter. No noise, just the very light vibration.

It starts at about 60 mph and 1700-1800 rpms, and when you are about to go up a hill and it stops as soon as you accelerate.

I've searched past threads and they range from the torque converter to u-joints and a drive shaft that needs balanced.

Any input?

 

Rotate your tires, its a simple way you can do some self diagnosis...
If need be, rotate the spare into the mix to see if its related to a particular tire/wheel... its one less thing on the check list...

 

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Any aftermarket accessories or modifications?

Louis
GM Customer Service

 

I would bet money on the U-joints.