Worn suspension????

[Lamone61]

This is my first post so bear with me.
2003 Tahoe 4WD 169k.
KYB shocks on all four corners, idler / pitman and bracket have been changed.
On the highway it starts to want to change lanes on it's own as it goes thru it's suspension travel.
When you try to turn into a parking space or make a U turn it feels as if the tires have trouble rotating and they squeel like crazy.
The torsion bar adjusters are cranked all the way in and the suspension bottoms out against the snubbers or it feels like it does during large bumps.
Last time at the alignment shop all ball joints, tie rods etc are all ok.
Any help is appreciated I don't mind putting money into the vehicle but I just don't want to throw parts at it.
Thanks

 

[mattbta]

Don't know about the perceived bottoming out, but for the trouble on the highway and parking issues you should check your centerlink orientation. Mine had been backwards for four years until I re-read this thread: http://www.tahoeyukonforum.com/threads/scrubbing-binding-while-turning-at-near-full-lock.86256/ (When I had idler/pitman arm, they took the link off and put it back incorrect.)

Worth a look.