Vibration

By estein00
August 15, 2011 in Ask A GM Technician

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estein00

Posted August 15, 2011

I have a 99 gmc sierra 2wd and i recently put two inch lift blocks in the rear. Now i get a a very noticable vibration from 20 to 30 mph. Any idea what it might be? Thanks any help is appreciated.

jro909

Posted August 16, 2011

check u-joints

cvandegna

Posted August 16, 2011

Check to see if the lift blocks are wedge shaped - some are to slightly rotate the rear diff to compensate for the new angle.

estein00

Posted August 17, 2011

Author

Posted August 17, 2011

The blocks are not tapered and im pretty sure the geometry on the u joints is now off would tapered blocks help that?

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