Ok, let me give you some back ground.

I have been building my jku rubi on the cheap....

I am currently running TF 2.5 coil set up with rough country 2.5 shocks. JKS front trac bar TF rear trac bracket. I am currently running stock controll arms ( all craigslisted/easily used to save myself $$)

So here is the problem....I am a fat bastard....

I have front and rear Rugged Ridge steel bumpers, with a front 10k winch, a kongo cage, poison spider sliders, and rock knockers, and OR-FAB Gecko Skin all on the stock 255/75/17 bfg's on soft 8's.
Then throw in pulling a boat and I am a loaded down sand slug.....

So now with all the weight i have very little to no lift. This is ok for now running the stock rubi bfg's but jumping up to the next size tire my get intersting.
I plan on sleeves and gussets as my next adventure and 35's. I do not plan to go bigger that 35's as this is a daily driver also...but again never say never....


This brings in the question should I go with Tera Flex 3' coils or Rock Krowler 4" coil.

The reason for the choices are i have a chance to pick up a used set of tf 3' coils, thinking that this could be an easy swap out, with the weight the 3 inch coils will set me back up to that 2.5 lift i am looking for. ( i have heard the TF 3 coils will yield 3.5 on stock jku and on 4.5 on stock 2 door...atleast so ive heard.) If this plays out as planned it should be an easy swap of the 2.5 coils to the 3. Hoping no other changes are needed????
These are coils only....(from a local who swapped from 3 to 4 inch coils on his jeep, oh and they are half of new for cost)

The other option is a RK 4 inch coils, Rancho shocks, RK rear trac bar bracket, longer pit man arm swaybar links and brake line package. ( again this is used from a local who upgraded and is asking 1/2 of new price for this as well.)
I do not know what coils are better,and what the RK will yield for lift.
Also i could not find the RK 4inch coils, he said that they are older and RK now goes witht the 3.5 coils?? I really don't know? He was running this lift with 37's on his mostly stock jku.

The question is if i go to the RK will i have to adjust steering in any way other that dropped pitman arm? ( high steering kit or do i even need the arm?)
Will I need controll arms on either lift?
Will i need to change drive shafts?
Brake lines for the TF coils or longer sway links ? ( running extended already from the 2.5 lift)
ANy steering issue with the 3" TF coils
If I buy both the RK and the TF, could I combine the two and sell off the parts I dont need?

Wlll i be able to use the rough country 2.5 shocks with the tf coils or as i said buy both and use the rancho shocks, due to lenght issues, or as an option for the .5 inch or so of gain, use the shock extentions that were included on the 2.5 tf lift i currently have on and never used?

Sorry for all the questions, and thanks for the help.
It was easy with 2.5 everything i needed was there, making a Frankenstien pieced together lift my be a little more difficult

 

Anyone? THANKS :-)

 

TF 3" coils lift the front 4.25" and 3.1" rear. Now if you have a 2dr and buy the 4dr kit you can get about another 1/2"-3/4" out of that. I hope that helps. You will more than likely need longer shocks with those coils. Brake line extensions for the rear and a set of new longer lines for the front. Stay away from a drop pit man arm, unless you want to have sector shaft issues. You should only need a front adjustable trackbar.

 

We never had 4" systems for JK's. Only 2.5 - 3.5 and 5.5 systems. If we were in your shoes, we would look at how Tera and us Lay out our systems on our websites and do your best to match components to get there! From the list of used parts from us on your thread, it just likes like some parts and not a complete kit.

We would recommend front lower control arms, adjustable front track bar, rear track bar bracket, front and rear sway bar links, brake lines and shocks at the very minimum given the lift heights you are talking about. Even if it is on a heavy JK..

RK