Lets start out by stating that i have an 07
2 door JK wit a 4" Super ride lift. Also both of my driveshafts have been slinging grease for about a year now. Ok, after reading all of the replies to another one of my posts, I have decided to go with Coast drive shafts both front and rear. I know I will need rear upper adjustable control arms, possibly TerraFlex. If I want to move my rear axle more to the rear to regain wheel base that I lost after installing my lift, I will need rear lower control arms as well. Now on to the front. I know I will need front lower adjustable control arms to change my driveline angle. I must also state that my steering is very flighty at highway speeds. What should I do to correct this? Should I get front upper adjustable control arms or go with some other steering correction fix? I really need some good input on this before I make a big monetary investment. I don't want to do this half a$$, I want to do it right the first time to solve all my suspension and steering issues. I am also open to suggestions on adjustable control arms.

 

I like the TF flex arms...all 8 are adjustable. Smooth straight ride no flightyness. Adjustable trackbars and flipped draglinks also help.

 

The lower front control arms will correct the flighty steering. The upper front will help with the driveline angle. You will have to balance between them to get stable steering and minimize the driveline angle in front.

Rear upper control arms will reduce the rear drive line angle.

If on a budget, you could try skipping the rear lower control arms and the front upper control arms and only buy the rear uppers and front lowers.

To do it right (and money is no object), get all eight.

 

Which components came with your lift? Cams? Fixed ca's? Trackbar bracket? Drop pitman? The answer will depend on your current setup.

If the flightyness is caster related:
Front correction is the same as the rear. One set will 'tilt' the axle, the second set will allow you to move the entire axle. You can't adjust the caster without affecting the pinion, so your choice is to tilt the top of the housing forward/backward, or tilt the bottom of the housing forward/backward, or get both sets to allow you to fine tune the positioning.

Front lowers will likely be all that you need.

 

My lift came with a front adjustable track bar, cam bolts, rear track bar drop bracket, springs, shocks and longer sway bar links. All of my control arms are stock. The cam bolts are on the front lower control arms. I noticed that my rear axle is further forward after the lift. Will moving the front axle forward and moving the rear axle rearward give me any type of advantage over where they are now?

 

Would you happen to know what your caster is set at? I would guess that the cams may have slipped, lowering the caster, which is causing the flighty steering.

Unfortunately, your new front shaft will need different pinion angles, so you may not be able to get rid of all of the flightyness. 5-6 degrees seems to be fairly normal caster with stock driveshafts and a lift, but you may need to be down around 4 deg with the double cardan. It'll be trial and error once the adj arms and new driveshaft are on to find the sweet spot.


And if you didn't read it previously, you will want to remove the cams and have the holes welded back up before installing the new arms.

 

Ok!!! I climbed under my JK this morning to check out a few things. First of all, my caster is at 3*. When I installed my Superlift, I evidently overlooked a step in the install process. The lift instructions called for removing the front lower control arm bolt and to removing the rear knock out in the mount to allow the cam bolts to change the caster angle. I did not remove those knock outs. This explains my caster problems. I gues this was a blessing in disguise, since I will be installing front lower adjustable control arms. Now I will not need to have someone weld up the bolt holes since I did not remove the knock outs. Any further input guys?