I've been using WP fixed length control arms suitable for 3" lift. My JK these days sits at over 3.5"+ lift now. I've bought RK adj LCA's front and rear, and adj rear uppers. The rear WP LCA is about 2" shorter than stock to help correct pinion angle of rear drive shaft. I'm using the new RK adj arms to stretch the rear back out to just a little longer than stock, maybe .25" to .5" if possible. Question is, what length do I extend the rear uppers to regain good pinion angle, or how do I figure the right amount without bowing the coils out too much making the coils contact the trackbar when flexing? thanks

 

Nevermind, wayalife just gave me all the info I needed, thanks

 

I would like to learn the same thing ,, would you share there link

Thanks

 

It turned out to be very simple. Park on nice level ground. With your rear lowers on, rear uppers off, jack up your rear pinion until it's level with your drive shaft (or as level as possible). Measure eye to eye and adjust your new arms accordingly. Was simple enough that now I'm going to start over, and stretch the rear out just under 1/2".

 

I assume you mean with the rear stock lowers on?

 

yep that's all there is to it.

 

Very helpful thanks a lot