The more you crank the torsion keys the harder it rides...
Forget about the OEM tierods, their a joke....and get-
http://www.cognitomotorsports.com/pr..._Steering.html
http://www.cognitomotorsports.com/pr...Hummer_H2.html
http://www.cognitomotorsports.com/pr...Hummer_H2.html
I intentionally left out a solid center link as thats more expensive than all three of the above.
Inspect the steering shaft and everything else for play. Just get someone inside the truck, have them turn the wheel back and fourth while your looking at the steering components.