I got my truck back from Firestone after requesting front end alignment specs of left 3.2 caster and right 3.5 caster. I was told that the front end isn't worn but they can't reach these specs without new control arm bushings. The caster specs after alignment are L-1.80 and R- 1.84.
What ya'll think?

 

I think you should take it to another shop, 1.8 isn't near enough caster. Even with worn bushings you should be able to get at least 4*.

 

That's what I'm thinking also. I looked at the cams on the control arms and it looks like there is a lot of adjustment there. It looks like the more the cam rises on the contact area the more caster you would get. Is this right?

 

Yup. If you rotate the cams toward the back of the truck it pushes the bottom of the axle forward.....more positive caster.