Highway lane drift problem???

Thats the exact problem I've got. I had Townfair tire do the alignment when they put the tires on though, I think they changed one of the settings. I'm going to have the dealer put it back or try one of these settings suggested here. I think Townfair straightened them up too much.

 

My truck was fine stock, but once I got the 5100's on at 1.75 i noticed the "light floaty" feel pretty significantly. Then when i got new tires it helped some but I still can feel it a little. Maybe adjusting the caster would help my situation

 

Extra caster will mean the spindles are tilted back more which puts more pressure on the steering geometry to stay centered. You will also notice the wheel wants to snap back to straight and center more so after you make a turn. Camber and toe should generally be set to 0 degrees. Actually a little toe in is preferable; about a 1/16 inch toe in for each tire.

 

Dump the Dunflops!