I'm getting ready to install a 2.5 OME lift on my YJ. I have two sets of heavy duty shackles; one is standard 4", the other is 5" boomerangs.
I'm wondering how much the 1/2" lift booms will effect my steering. I read numerous threads on different forums, but haven't found anything that would pinpoint this answer. I realize that the small shackle lift will change the caster angle, but I'm hoping to hear from voices of experience with similar suspension setups.
Does the slight lift throw the caster off enough to install caster shims?
Return to center?
Bump steer and wander?
I'll be running 31's or 32's (with body lift) if that has any bearing on it.
I ended up having to put a small shim in mine when I went to 1/2" booms. My 89 also has a 4" lift, running 31's. I also threw away the trac and sway bar. The return to center was effected slightly, but driving down the road without the shims was greatly improved after I put shims in. Play with the torque on your shackle bolts, took me a few times to find its sweet spot, but don't over tighten them.
I've also been playing with the thought of simply trying both sets to see where it got me. That in itself still may not be a bad idea, but the standard set was shipped to me by accident after I had already received the 5". So it's put me in the unique position of trying to decide which set to send back, or sending payment for the standards and trying out both sets.
Yes its true that every jeep is different but its a universal truth that longer shackles exacerbate existing problems more than create their own. Go up to an inch lift if everything else is squared away.
I run 1/2" booms with my ome springs. Everything seems to work great. I'm going to throw out BESRK for shackles. Pm him here on the boards. You won't find a better price, he is awesome to deal with, his product is great, and shipping is quick.