Need to have wheel alignment checked/adjusted

[mike's1965]

Had my truck aligned in 2011 right after upgrading to power steering and front disc brakes, drove pretty good.

Got new tires this year and just drove it the farthest it’s been in years to Dino’s Git Down on other side of Phoenix, maybe 100-120 miles round trip.

Driving on freeway it feels unstable when turning even if it’s just a little bit and I felt like needed 2 hands to keep it stable.

Discount Tire near me does alignment but doesn’t do old stuff, anyone know of good alignment shop in Phoenix area?

Could try the shop I went to years ago but it’s far away and they had truck several days, so would need 2 rides to drop off and pick up.

That shop back then would not give me sheet with the specs before and after which seemed odd.

Also maybe it’s not alignment but something else, any ideas?

Don’t want to wear out my expensive new tires plus it feels kind of scary going 65 mph going on overpasses with curves.

[geezer#99]

What tire and what tire pressure do you have?

[mike's1965]

Bf Goodrich Radial TA 275 60 15. 35 psi cold

[geezer#99]

Possibly 35 psi is too much. Makes your tires crown in the middle.
Try 28 psi and see if that helps.

[theastronaut]

Having it aligned with more modern specs will help a lot. You want about .5 negative camber, as much caster as it'll adjust to, and 1/16-1/8" toe in.

The factory specs called for little to no caster, adding more will help straight line stability and will increase steering feel/feedback.

Sometimes power steering is over-assisted and makes the steering too easy, which makes it feel darty- especially with no caster. Borgeson makes a kit to reduce the output pressure of the pump to regain some steering feel/effort.