[Mike C]

I ran my 4" lift without any steering correction for a 10 years. With 2 1/2" you should be fine. When I put my new steering box on, I replaced everythig from the pitman arm down. used a 91 Suburban arm, replacement drag link and Pro COmp 4" steering arm. I would put your truck together and test it before buying the new pitman arm. Just to verify, their are three ways to compensate the steering for lift: Drop pitman arm, attaches to steering box, drop drag link, goes between pitman arm and steering arm, and the raised steering arm which is attached to the steering knuckle. Raised arm is the most common.