I am in the process of moving from a 2.5" AEV lift to a 4.5" lift. I have purchased all the bombproof RK control arms. Got the 1" extended for the rear to move my axle back an inch. Purchasing a new rear track bar from RK, going with a new Tom Woods front drive shaft. Switching out my brake lines. I was planning on using RK springs, but it seems they only have 3.5's and 5.5's. I've read that some people have said that RK has the largest springs so would the 3.5" really come in at 4.5" on a 2 door? What is your suggestion for 4.5 " springs.

I am putting this on a 2012 2 door Sahara with 35" KM2's and PS aluminum fenders.

 

Go with a good 4.5" spring. With a lot of weight they'll net you closer to 3.5" anyway.

 

I run the synergy 4.5 springs. They have stayed at the same height since I had them. Over a year now with no sag.
Great ride.

 

That doesnt look much taller than mine, or are you running 37's? Maybe i need to go 5.5 inches.

 

I'm running the TF 2.5" lift with front 2.5" Rk springs on 37's. Just came back from big bear last.weekend from running John bull, dish pan springs and Holcomb creek. No rubbing any where

 

Yep. 37 mud grapplers.

 

What size/how much bump stop? What do your BFGs actually measure mounted and what size is actually on the tire?

Sent from some string and a few tin cans.

 

Im running 2.5" bumpstops front and rear but I also have bilstein.shocks for a 4" lift up front and 2" rear.
Right now with the tires mounted, with about 40% tread and 30psi, they measure just a hair about 35.5". Brand new they measured 36.8"