I'm installing a new set of Currie control arms rear and front upper and lowers. I was using the writeup here to install them and now they are on the springs have a bow to them towards the rear of the JK.

The settings they say to use are
Fronts are Lower 22 5/8″. Upper 18 3/4″

Rears are Lower 19 5/8″ Upper 17 11/16″

The issue is when I went to the currie sight to look at their instructions they had in the sentence the settings are for a 2 door. I have a 4 door and I'm concerned how do I determine the correct length in the first place?

 

Angle finder to find your pinion angle in regards to your driveshaft angle. Adjust accordingly.

 

Ok, where do you measure this from? caster angle I see for the front in the writeup from WOL on the basic front end alignment but the rear I'm not sure about.

What did you use as starting measures for the arms? Worst case I guess I could set it the same as stock and then I'll know I'm at 2.5 degree caster.

 

Set the angle finder on the flat yoke section at the rear pinion, that's your pinion angle. Now, set your angle finder on a flat surface, closest to the rear pinion, on your driveshaft. That's your driveline angle. Document both. Remove the stock upper control arm and place a jack under the rear axle, closer to the pinion flange. Jack it up slowly until the driveline angle comes damn near close to the pinion angle. Adjust new control arm to bolt directly to the mount at that angle.

 

I know it's not Currie, but the Teraflex site says 4 door with 3" or 4" lift rear lowers should be 20-3/8" and rear uppers should be 18-3/8" I wouldn't think there would be much difference in control arm length from different manufacturers, but I could be wrong.

 

I wouldn't think there would be any difference either. The length is the same no matter what or who mfg. them. Pinion angle will come into play and that will make a difference as to how long or short you need to make them in the end. Trial and error will be needed if the suggested lengths don't work.

 

When I wnet to install my FT control arms with my driveshaft upgrades I searched these forums and came up with all kinds of numbers.
To me the Teraflex numbers seemed entirely too long, Currie's the stock lengths. I read Eddie's FT Ultimate install and sort of came up with my own numbers. One concern was clearance between the ARB front diff cover and the FT front trackbar, as there is no extra clearance there.

I set the front lowers 1/4" longer than stock and the front uppers about 1/8" shorter than stock. This gave me a caster of 7.1 and most importantly no vibration with my JE Reel 1310 front shaft/yokes or contact between the diff cover and trackbar.

The rear lowers are 3/8" longer than stock with the uppers set for pinion angle. The 1350 JE Reel rear shaft/yoke/flange is also vibration free at this setting. The 3/8" increase in length definitely moves the tire away form the pinch seam but clearance at the rear of the fender doesn't seem to be a problem. The whole rear end of the Jeep is much more solid now, no "rear steer" feeling like I had with the stock control arms with the OME HD lift.
I did have an problem with my passenger rear coil contacting the FT trackbar on compression, but rotating the spring to the proper position fixed that (I installed it wrong the first time).

 

Have you found the answer to this yet? I'm also interested in the "official" answer to this question since I'll be installing a Currie lift on my 4 door in the next couple of weeks. Maybe David @ Currie will chime in?

 

I have to agree with you for sure...3" lift with TF front lowers and initially I used their recomended numbers and they were way to long...I think I wound up around 1/4" longer than stock as well....
...long story short, if your having troubles setting it up you've got some good advice already, check your pinion/driveshaft angles and caster numbers and let those guide you to YOUR appropriate adjustments...and if it handles great without driveline vibes you've probably got it set if in doubt don't hesitate to get it to a reputable alignment shop

 

well I got it all in and I'm currently at the following measurements.

I went with 20 1/16' rear lowers, Upper 17 11/16"

front I went with Lowers to 22 3/4″ and Uppers to 18 13/16″

My manual measurements are 3.5 degree caster on front and back and I bring it for an offical alignmnet tomorrow to see what they do. I beleive they will fix the front lowers by two more turns outward which will yield 1/8"

The rear will be a combination of sorts but I couldn't get a setting that worked.