4WD and AWD are not the same thing. In your original post you mention the truck if AWD. If that's the case, there is not a way to disable the AWD. If your truck is 4WD there will be a switch that allows you to select different modes. If one of those modes is 2WD, then you can easily disable the 4WD.
Is the steering wheel "jerk" a repetitive jerk or is it more random, such as when you hit a bump? I would expect the damaged anti-sway bar end links to cause a noise on bumps but not to cause a physical jerking sensation. But, quite honestly, if the bushings are shot there very well could be other parts up front (ball joints, tie rod ends, suspension bushings) that are also shot and causing looseness in the front end.
Also, you could try swapping the wheels and tires front to rear to see if the sensation changes. You could still have a tire issue that is just not visually apparent.
-Rod