You probably already know, I just put on a mix and match 2.5 suspension lift. I used Pro Comp springs, Rancho RSX shocks, and poly bushings. I LOVE IT. I didn't shim the axle or drop the t-case, and I have no new vibration, just a better ride on and off road and better approach angle. I took it wheelin the day after install and did some stuff I couldn't do before. I don't think a 2.5 will give you any trouble, depending on how much shackle lift you have. I think once you start getting into lifts over 3" you start having to do t-case drops and axle shims. Good luck brother. <img src="/forums/images/graemlins/cheers.gif" alt="" />