The Teraflex CAs are finally arrived, but I think I need some help to get the installation complete.
According to the instruction book, the front lower CAs need to adjust 1.2cm longer than the stock arms, so that I need to move the front axle to the front a little bit. If I do that, the front drive shaft will be dragged a little longer, however, will this movement cause any problem(I am using stock drive shafts)?
For the rear lower CAs, can I adjust them a little longer for pushing the rear axle to the back a little or I should make them as long as the stock rear lower CAs?
For the front upper CAs, what are the best length for them?
For the rear upper CAs, can I judge the length of them by looking the angle of the rear drive shaft( I am still using the stock rear drive shaft)?
By the way, is the best caster angle for the 3.5+ lift and 37s tire between positive 6 degree to 7 degree?
Thanks!

 

I am still using my stock shafts with my 4" Superlift and basically all of my arms are set to the shortest setting so the stock shafts won't fail. I remember when I put them on that the I did adjust the front lowers a bit longer than stock, but I couldn't tell you if it was 1.2 cm or not. It sounds right. It was a pretty minimal difference. My rear uppers were the shortest to get the pinion angle right if I remember correctly. I think if you start off with them all at their shortest setting, you should be ok for a while using the stock shafts. Can't think of any exact measurements to tell you, but I hope this helps.

 

in a nutshell, for the front lowers i like to start at about 23" eye to eye. the uppers need to be determined by the amount of caster you'd like to have. for the rear, you can make the lowers a bit longer but not by much - maybe a 1/4" longer. go too much and you will start having other problems like your track bar rubbing up against your coils. the uppers should technically be adjusted evenly so that your output shaft and pinion yoke are parallel but, being that the stock shafts have cv joints, you can set the uppers so that the pinion is in line with the drive shaft. that way, when you can afford new u-joint style shafts, you'll already be set.

this write-up should help you out:

http://project-jk.com/jeep-jk-write-...ation-write-up

 

Thanks for the reply! Did you feel any driving different before and after the installation of the new arms? I think the front lower CAs must be adjust a little longer to get the right caster angle, maybe other arms can remain in the shortest length.

 

Thanks for the help! For the installation of the front lower CAs, I must move the front axle to the front a little so that the new arms can be fit right? Will this cause any front drive shaft problem?

 

no. the only reason why you would lengthen your lower arms, front or rear, is to reposition your axles back to about where they were before installing your lift. it is not required and going too far foward will create other problems.

 

I will take my Jeep to the Jeep dealer in my city for the installation of the new arms tomorrow, and I will bring the Teraflex lift kits installation guide you just provided too. I think I will get more clearly idea when the installation begins.

 

Honestly, the dealer might not be the best place. They often aren't familiar with aftermarket stuff - hopefully you have a good dealer than can help you out.

And yeah, I noticed a difference when I put in the arms, but then again, I put my lift on at the same time. All I know is that my JK rides great on road and I am not messing with the adjustments till I can get the new shafts. I would love to move my rear axle back a bit because as it sits now, it's a bit too far forward. I could move it back about an inch, set the pinion with the uppers and be good to go.

I am wondering though, for my front - should the caster be between 6 and 7 for a 4" lift with 35s? The 6 degress of caster is pretty much ideal, no?

 

From an article here, a JK with 3"+ lift and 35"+ tires should have the caster angle between 6 to 7 degree positive, I will try that tomorrow as well.