2005 Yukon feels loose on the freeway

[Peeledpeas]

I've looked at everything I can think of and nothing appears worn out or loose with the suspension. But when driving on the freeway the whole vehicle feels unstable, like, swaying a bit in the rear end. The only real defect I can see is that the air compressor is not working for the auto ride suspension. The expensive rear shocks are in good shape and were replaced a few years ago. Could the compressor not working actually make the car unstable at freeway speeds? I've checked it all, wheel bearings, tire pressure, ball joints, tie rods, track bar, trailing arms....etc.

 

[Fless]

Two things I'd look at: do the jounce stops on the front end contact the lower control arms at ride height? They should since they are a fulcrum point in the suspension.

Any recent work done on the front end? Is the center link correctly oriented? https://www.tahoeyukonforum.com/threads/make-the-tahoe-new-again.131838/post-1645765

 

[rockola1971]

Check tires for a busted belt. I caught a nail in my Tahoe's rear passenger tire and it went through the belt. The belt exploded within the tire then steel wires started poking out the sidewall.