2012 JK Pulls left / alignment specs seem odd. Need help. - Jeep Wrangler Forum
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Old 11-21-2013, 10:14 PM   #1
habrams99's Avatar
Join Date: Jan 2011
Location: Bordentown NJ
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2012 JK Pulls left / alignment specs seem odd. Need help.

Greetings All, I've got a 2012 JK that's been pulling slightly left since the day I got it new from the dealer. I had the dealer check it out shortly after I bought it and they could not find anything wrong (what a surprise). It was never that bad but after a year and a half, it's annoying enough that I want to finally get it right.

My JK has a dealer installed 2" budget boost (I think its AEV) along with AEV Pintlers and 34" Nitto Trail Grapplers.

The pull to the left is mainly noticeable at highway speed. Also, I don't think it's my imagination but I'd swear it's worse when the temp outside is colder. Tire pressure is equal all around at approx. 31lbs. I've also swapped left and right tires with no change.

I found the front axle was off by an inch over to the driver side probably due to the lift but still using the stock track bar. I read that only 2" inch lift should not cause the need to replace with an adj TB but decided to go ahead and install a JKS adj TB recently hoping it would stop the pull. It improved handling slightly but it still pulls left.

I took it over to a local alignment shop knowing they can't do much except adj the toe. I just wanted the readings to see if it might give me a clue for what the problem might be.

The readings for the rear were all well within spec. The front camber on both sides is fine too. Caster seems way too low compared to spec. It's only +2.4 but at least it is equal on both sides. Seems that would only cause it to be less in a hurry to return to center, maybe a little looser steering feel, but not cause a pull. I'm not sure and would appreciate input to see if it is really worth spending money for adj LCAs. I've also read about AEV's brackets that lower the front UCAs and LCAs. I'm thinking about getting those, but they aren't recommended for only a 2" lift. Considering how low my caster is now, maybe they would be ok?

The toe settings are what really seem strange and the alignment tech even said "your wheels are pointing right but its pulling left." Left toe is +.46 and right is -.42. So total toe is +.04 which is a little low compared to spec, but I'm concerned that each wheel is so far off. Could this cause a pull to the left?

Also, I've read that some aftermarket steering stabilizers can cause a pull, but mine is still stock. I may pull it off anyway just to see if it makes a difference.

Appreciate any input regarding what adjustments I should make, or what parts I should be considering. Thanks

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Old 11-21-2013, 10:28 PM   #2

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2" bb should not be causing those issues. Def not shift the axle so much.
Did they fix toe ?

I think the shop never loosened all the TB and Ca bolts and just dropped the axle and tossed in the spacers. Seems to be the bushings are all in a bind causing odd ball readings and handling issues.

I could be wrong but there's no way 2" spacers should drop caster that low.

Either that or the the tech doing the alignment doesn't know what he's doing.

2007 Rubicon/Rock Krawler TR 2.5 coils/rear TB/Rancho 9000 31/32XL shocks/Teraflex monster TB/Synergy highsteer,tie rod, ball joints/Hankook MT 315-75-16 on Level 8 ZX's/MC front SB links/Rancho geo brackets & shocks/Fox ATS stabilizer/Adams front DS/Artec front armor w/ Currie upper bushings=Frankinjeep from hell.

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Old 11-22-2013, 12:24 PM   #3
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Join Date: Jan 2011
Location: Bordentown NJ
Posts: 8
Thanks for the response. I didn't have the toe adj yet because I figured I'd be taking things apart again soon. Didn't want to pay the extra money for the adj either since I can do that myself.

Interesting theory on binding bushings and easy enough to check. TB should not be an issue since I just replaced it, but I can loosen up the CA bolts and take a quick ride to let everything settle in at a more natural position, then torque it all back up.

Maybe the caster started out too low at the factory and the lift just made it even worse. I've read that it's not unheard of for suspension specs to be out of whack when being put together on the assembly line. Maybe I'm one of the "lucky" ones...

Depending on what happens, I'll find another alignment shop and get a 2nd set of readings to see if they're consistent.
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