Q&A

 Master

Check the tires for damage, try rotating the tires front to rear and see if the problem changes. The wheels were probably balanced off the car, Check for play in the front wheel bearings, suspension bushings and I can't remember if your truck has a steering damper (it would look like a shock absorber going across the front of the truck). If the steering damper is bad it would definitely cause a problem like what you describe, but your truck needs to be inspected to pinpoint the exact cause of the vibration.

My 4runner had the same problem..it was the rack and pinion that was worn.