Rock jock adjustable control arms

Angle finder and this
 
If your uppers are stock length set the lowers about 24 5/16". That should get you good enough until the day you decide to have it checked.OR as I do adjust the lowers until the pinion is at 0 degrees which will put you around 6 degrees pos caster . I normally put a bottle jack on the flat spot on the bottom of the diff kind of towards the pinion as the springs tend to rotate the pinion down . That way you can adjust the pinion up or down with the jack to help you get 0 degrees at the flange where the ds bolts to the pinion . Then adjust the arms to line up with the mounting holes
 
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