Newbie here. My Info first:
JKU- Recently installed RK 3.5" mid-arm flex system, running Nitto Trail Grappler 35/12.5/18 at 28psi all around. (Factory steering stabilizer)
Since I lifted it Jeep pulls slightly to the left, increases with higher highway speeds obviously. I also noticed today that the rear axle is off center about a 1/2 inch to the passenger side. 1) Could that be making it pull/veer to the left? 2) How big of a deal is it that my rear axle is off center(as far as damaging other things)

 

Have you had the Jeep aligned since installing the lift?

 

Yes sir I have. They say good to go

 

is the rear end shifted to one side or is it turned to one side? I am running my jeep at 2.5" with the stock rear track bar and no relocation bracket and the rear end is shifted over to the right but it still drives straight.

btw before anyone gives me any crap about that, the track bar bracket I got was the wrong one and I already had everything else installed will have the right parts by the end of the week.

 

Did you or the alignment shop re-center the steering wheel? You might think it's pulling because it's off just a hair. It's easy to correct if not using the drag link. Takes about 10 minutes.

 

That system has just front lower control arms, correct?

A common reason is due to how the caster is adjusted. It should be slightly different from side to side. Do you have your post alignment data?

Also, there is a rear toe measurement that does matter. You can't actually adjust individual toe on the rear (obviously), but total toe can be adjusted. Basically, it is adjusting the axle in relation to the jeep. Imagine if you had adjustable rear arms and you made one side an inch longer. Axle would be crooked (hence, toe of each Wheel is off). You want those to be the same.

Lastly, and I have no data on this other than I saw it come up in another thread, but people are saying the Trail Grapplers are known to pull left.

 

I have the same problem. The trail grapplers seem to do that which I just can't beleive and would consider totally unacceptable but I think it's true. I aired up to 38 lbs and switch the tires left to right and that seems to help. My alignment is good too. I think the concept is called radial pull. I'm intersted to hear what people have to say about this this too.

 

For what's worth, my Dad has the same issue when he put the Nittos on. He went back to the show where he got his post alignment lift done and they adjusted the caster on one side. There is a range and one side can easily be .5* different than the other. You CAN solve the pull by adjusting caster on one side. He had it adjust .3* on one side and it drives straight now.

 

thanks for that advice! Never heard of that being done. I think I've checked every other option. I'm going to try to borrow a buddy's wheels/tires to check the TrailGrappler theory.

 

So here's a question, I have a pull to the right and am thinking to adjust my castor on one side to correct it.

Which side gets the higher castor?