Guys

Help needed here.

4" Teraflex lift installed but now jeep tends to go towards driver side rather than straight. the caster is about 7 deg. any one know how much length they've adjusted their upper and lower front arms? also noticed that the rear upper arms set at different length left compared to right side.
It is really annoying this way and need some advice on how to get this right. those who installed it said that all lifted jeeps are like that (Bull****t)

Thanks for any help

 

This is not correct. Factory caster is set to +4.2° and less caster will cause your Jeep to wander and feel darty on the highway. +/-6° for 4" of lift and 35"-37" tires is pretty standard for a JK.

The JK uses CV joints in its driveshafts and you should not have any vibrations even with an additional +2~3° caster.

This is acurate and should help.

This is acurate and correct.

Other things to check are tire preasure, brakes and loose suspension components. If you've had your bigger tires on for a while, you might want to check to see if your driver side wheel has any camber to it. The "C" part of the front axle has been known to bend under the stress of larger tires and this will cause a drift. I have it on my passenger side and have a slight drift to the right now.

 

Run 35" Dick cepec tires. if the rear axle not correctly centered might cause this problem?

 

Depends on how far off it is. If it's just a bit (1/8"-1/4"), it really shouldn't but, the bigger the foot print you have, the more amplified any issues you might have will be. Either way, it would be a place to start.

 

Thanks guys

I will perform the checks and post results, soon.

 

Thanks WOL, glad you chimed in

 

How big of a tire are you talking about. The Rubicon comes with a 32" tire. I installed 305 65 18's on the stock 18" wheel with 1 1/2 spacers. I think that measures out to a 34" tire. Should I expect any problems?

 

I was running 315/70R/17's (35" tire) for a long time and wheeling the crap out of my JK without any problems but just before I moved over to 37's, I did start to notice a bit of camber on my passenger side front wheel. Now that I have 37's, it is definitely noticable/measurable and causing a slight drift. Need I say, I would think you should be okay but if you know of a good welder, it certainly wouldn't hurt to have your "C" gussetted up.... just in case.

 

Since I disagree about the caster stuff so I'll avoid comment. But when you post back can you verify if the pull is gone, the same, or worse when you apply the brakes? It can tell us a lot.

Drag at a wheel can cause your pull, so jacking up the Jeep and free spinning each wheel can eliminate a handful of potential problems. If each one freely turns by hand with drag similar to the others, that is good.

Tires can generate a pull too. After the obvious tire pressure check (already mentioned), you can do a temporary "custom" tire rotation to eliminate tires from the list of problems. Just put all of the right hand tires on the left and left hand on the right. If the pull switches sides, the problem is the tires. If not the tires are not the problem.

 

The TJ also had the front pinion located on the base of the differential as opposed to the top on the JK. More lift = more angle on the drive shaft and less caster was set on the TJ to help reduce this angle.

Agreed.

Honestly, I'm not sure what you mean by being "stressed". What exactly do you mean by this?