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dont spend $70 on an alignment...its real easy...if you have a long 1x2 or something close and a few tools you can do it. i have been doing mine for about 2 years and i have always been way more satisfied with my work than anyone else's
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I agree with you. A straight axle truck is easy to align. The "tolerance" band that the shops shoot for is actually wider than you can find yourself in your garage with boards, tubes, whatever and a tape measure (or even just a tape measure).
The alignment is for your wheels, not your tires, so getting it done before or after the new tire install doesn't really matter. However, since this guy says the outsides of his tires are bald, his alignment is probably off. Plus, the garage method is just for setting toe. He may be off on his camber as well to wear tires like that. Again, you could rig a tool to measure camber, but you still have to go to an alignment shop for shims. Plus, most people never touch their camber on these trucks.