Hey all,
I'm in a KK with a 4 inch JBA lift, but I figured this question is relevant for the KJ community as well and I might get more answers posting it here.

My rear suspension is noisy over bumps since lifting. The clunking is not caused by contact between the gas tank skid and drive shaft, and there is nothing actually loose-- I had the 4x4 shop re-check it after about 150 miles. They said there is no safety issue and said it's probably the adjustable track bar making the clunking noise over bumps. The JBA track bar uses Heim joints rather than rubber bushings like the OEM track bar. The noise sounds to me like it's on the driver's side.

So, those of you running JBA track bars-- do you just live with the noise, or is there a way to quiet it down? Or am I barking up the wrong tree? Otherwise, I love everything about the new lift.

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2008 Liberty Sport 4x4 Automatic

Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof Rack
M116A3 Trailer build thread: viewtopic.php?f=72&t=77997

i dont know much about the rear suspension on the kk but check the shock bushings, if you have the bilstein 5100 rear shocks the bushing on the shaft end did not come with a metal sleeve installed, once the bolt that hold the bushing in place is tightened it is putting a lot of stress on the rubber bushing, mine always clunked and got worse over time, so i replaced the bushing with a new ploy one from energy suspension, the inside diameter was 5/8" and i put a sleeve in the bushing (make the sleeve about a 1/4" longer than the new bushing, now my rear suspension is nice and quiet. like i said idk much about the kk but thats about all i can think of.

I just had that prob on the kj I'm right at 4 inches for me it was the bushings on The top of the rear upper control arm ends check it!!

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Ome hd lift 07' kj limited
Rear isos 2 side
3 front conduit nuts
Wrangler duratracs 265x75r16
Cragar soft 8s 16x7
8000k fogs
Custom brake relocation brackets
Custom roof basket
Custom front chain bumper and covers
Custom fabbed radiator skid
Custom cb and antenna brackets

most common thing is the rear shock mounts are too wide for the replacement shocks. they need to be spaced with washers to prevent side to side movement thatll cause clunking.

i also had an issue with the heim joints on my track bar. there is no give in them like a rubber bushing so the heims wore a groove into themselves creating slop. this would cause a clunking noise also. replaced the heims and theyre good to go for the time being.

the kk does not have the wishbone rear UCA, the rear suspension is way different than on a kj, he just posted in the wrong section.