I have about 2.5" of lift and have replaced all 8 control arms with aftermarket arms utilizing Currie Johnny Joints.
But then again, I'm also particular that my axle is in the correct position (caster, pinion angle, clearances, etc).
Are aftermarket arms NEEDED for any lift? No.
Do aftermarket arms allow you to fix your axle position (if you know what you're doing)? Absolutely.
Fixed length arms are fine, provided the length is exactly what you need. For example, factory arms are the exact length you need for the factory suspension. For aftermarket suspension changes, you can determine what length you need by installing a set of adjustable arms, setting the necessary axle position (caster, pinion angle, etc), then making a set of fixed arms of the necessary length. But then again, that's kind of a useless 2nd step isn't it? Adjustable arms give you the best flexibility later down the road, should you change anything...like lift height, belly height, tire size, driveshaft type, weight, etc.
Originally Posted by pumpkinracer
I found a set that are adjustable with rebuildable, greaseable joints. I'll probably go with those.
just realize quality of arms, bushings and joints varies widely. Some are better than others. Bad ones can actually be worse than stock arms.