[mr48chev]

Before you spend any money read post 3 very closely and follow what he said. Get someone to rock the steering wheel back and forth slowly while you are under the truck looking at every connection in the steering and suspension. Start at the steering box and work your way out one tie rod end at a time and then while they put a little more grunt into turning the wheel look at every bushing in the springs and shackles to see if anything is moving when it shouldn't. Then check the king pins.

Toe in should be 1/8th in. Caster for todays roads should be between three and five degrees positive depending on the feel you want. The 1 degree positive was good for the skinny bias tires on the roads most folks had to drive on in the 50's when 55 or 60 was good highway speed but even then guys who put a lot of highway miles on their rigs ran more caster than stock trucks did so they would track straight. Camber is a non issue unless the axle got bent.