Hi Everyone,

I have been dialing-in the suspension on my JK. I have read a lot of posts but I don't recall ever reading any that specifically list caster change information based upon alignment details following adjustment.

Conclusion: Each turn of the Currie adjustable control arms will result in a change in caster of roughly 0.35 degrees.

(The accuracy of this information is only as good as the alignment information provided by Goodyear. They have checked the alignment 3 times: once after the lift was installed at approximately 600 miles, once at the end of March this year before adusting the control arms, and once yesterday after the control arms were adjusted.)

The actual results were these:

Caster before upper control arm adjustment: Right: 4.0 deg; Left: 4.1 deg

Upper control arms adjustment: Shorten control arms by 1-1/2 turns

Caster after upper control arm adjustment: Right: 4.5 deg; Left: 4.7 deg

Because of rounding by the alignment equipment, it really isn't possible to get it much closer than what I have stated here for my set-up; but, I think it would be a pretty good start for anyone looking to dial-in their suspension from a known caster value.

(I know that adjustable upper control arms are not really encouraged by a lot of people for adjustment of caster. I can tell you, though, that I was able to dial-in the caster without issue. Although I haven't tried to shorten the control arms any further, I know there are 6 or 8 threads showing on each control arm (between the outter control arm sleeve and the jam nut). Screwing the control arms together took a little force; but, my concern about not being able to shorten them further than I did on the original setup was unfounded.)

I'm not sure if this will help anyone else... but, I thought it would be good to post just in case.

Jeff

 

Awesome my uppers will be in tomorrow from Currie. Hope this will fix the wandering. Thanks for the info

 

Grab an angle finder and post those measurements also. (there is a DIY Alignment write-up in the write-ups area that shows where to measure). Angle finder numbers and alignment rack numbers are different, so posting both will help all the people on the forum that do it themselves.


Not exactly accurate. Lowers have a greater range of adjustability (adjust longer than stock to increase caster vs going shorter than stock for the uppers), so for those that only get one set of front arms, lowers are simply the better choice. Nothing at all wrong with uppers though, assuming you can get them short enough to get the caster where you want it.