Ok, I am running a TF BB on my 2011 JKU. I love the lift. I am running rubi springs and shocks too. I have had issues with sagging in the right rear. So bad I am running a 2.5 spacer in the right rear and a 2.0 on the left rear. Yesterday I measured and it is .5" low....Again! I am so sick of this issue. I don't want to go over a 2.5-3" lift. Any recommendations? I obviously need a better spring. I pull a trailer and I don't think that is helping. Any info would be awesome.

 

JKs will squat to the passenger side and slightly to the rear at times. It's called the JK gangster lean. It's worse with a full tank of fuel.

That being said if you are towing, you could be making that spring sag especially if it was already old. I am assuming you got it used from a forum member or something?

 

Switch to a coil lift. I would recommend either the AEV 2.5" or the RK 2.5" since they both use progressive rate coils. I run the AEV 2.5" and love it. Great ride on road, good flex off-road, and none of this "gangster lean" thing.

 

My Jeep is a Mojave edition which came with rubi shocks and springs. It only has 14k miles on it and never abused. I am also looking into the heavy duty OME kit

 

i just put on the RK 2.5 max travel a couple weeks ago, leveled out the factory rake, boosted me up, and it rides better than stock

 

From your profile it looks like you are carrying some extra weight that is causing your sag. The battery, fuel tank and sub are all on the passenger side and cause a bit of a lean on any JK. The drivers weight will compensate for and should level it out some when they are in the seat.

I would look at some coils with a higher spring rate to handle that extra weight. The 2" OME HD coils come to mind. They run a little tall so expect to get more then 2" out of them.

If you wheel and have a long travel shock that unseats your coils then a progressive coil would be nice to run but if not they are of no benefit.