I got our KJ's lift and JBA upper arms in over the weekend and got an alignment today.

Tech said he wasn't able to adjust the cams any more to get the caster within spec. Here is what we ended up with:


My question is whether the JBA arms are made for a specific side, they appeared the same and weren't labeled. I also didn't notice anything in his paperwork noting the need to be installed on a specific side.

Any chance I put them in on the wrong sides?

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05 KJ Limited: 3.7L / OME springs/struts/shocks, JBA upper arms, Clevis, Rear Isos, 245 70/17 Duratracs

91 YJ: 4.0, AX-15 / 8.8 , D30 w/4.88's + Spartan / 3.5 BDS Springs w/0.5" Booms / 1" BL / UCF Ultra High clearance T-case/Engine Skids, AtoZ Rockers, LOD bumper / Full Cage / 35x12.50 MTR/K's

They are not specific to the side you put them on. My Caster was also slightly out of spec after the JBA upgrade, key is to have them equal on each side. Some align well, some don't.

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2004 KJ Limited
Eaton "e" locker front
Detroit Locker rear
Frankenlift II
245 75 16 Goodyear MTR's
Moabs
Al's UCA's
Boulderbars
Backbone with Warn XD9000i, Viking synthetic line
Rubicon Big Brother

Cool.

I won't worry about it much then.

FWIW though, isn't one of the main reasons to upgrade to the JBA arms to increase the ability to get a good alignment? That and add clearance between the UCA and stut?

Definitely a nice piece, I would have bought them solely on the ability to replace the ball joints without the whole UCA, just curious.

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05 KJ Limited: 3.7L / OME springs/struts/shocks, JBA upper arms, Clevis, Rear Isos, 245 70/17 Duratracs

91 YJ: 4.0, AX-15 / 8.8 , D30 w/4.88's + Spartan / 3.5 BDS Springs w/0.5" Booms / 1" BL / UCF Ultra High clearance T-case/Engine Skids, AtoZ Rockers, LOD bumper / Full Cage / 35x12.50 MTR/K's

Give it some time,the coils will settle some.Caster is not a tire wearing angle,you need some caster and to be fairly even but if going to bigger tires a little less caster is okay and actually wanted.

More caster ='s better high speed tracking but heavy low speed turning,less caster ='s easier low speed turning but less stability at higher speeds.

Thanks for the replies guys.

Used to solid axle steering where all I set is the toe and dont worry about the rest

Gonna let it ride

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05 KJ Limited: 3.7L / OME springs/struts/shocks, JBA upper arms, Clevis, Rear Isos, 245 70/17 Duratracs

91 YJ: 4.0, AX-15 / 8.8 , D30 w/4.88's + Spartan / 3.5 BDS Springs w/0.5" Booms / 1" BL / UCF Ultra High clearance T-case/Engine Skids, AtoZ Rockers, LOD bumper / Full Cage / 35x12.50 MTR/K's