got an alignment check and tires/wheels balanced today because of a high speed shimmy at 65-75mph, hoping it was just a tire/wheel outta whack. JK is still pulling to the right but no real big deal to me. however, my thrust angle for the rear is -0.30 degrees and the alignment guy asked if it had been wrecked or if it pulls to the right (he doesnt work with ORVs often). i have the rancho 4in sport lift with trackbar brackets front and rear, no control arms. wondering if this can be fixed and how. he told me the front wouldn't "read" correctly until i got the back axle lined up right. hope the spec sheet is legible. any input from you guys would be appreciated. thanks

 

In the rear, one toe is positive and the other is negative. I'm not an expert, but that is telling me that your axle is not perpendicular to the centerline of the vehicle. It appears that you might need adjustable control arms in the back I think the left rear needs to be moved back.

 

they told me the rear axle thrust angle should be causing the jk to pull right. but i think your right too.

 

These two posts are saying exactly the same thing.
You are both right.

 

Thanks ronjenx, ive seen you weigh in on similar things before. Do you think I'm looking at rear uppers?

 

One set of arm will 'tilt' the axle. - (upper arms will move the top of the axle forward/backward, but the bottom doesn't move. Lower arms will tilt the bottom of the axle)
To do what was mentioned above, you will need both sets of arms. This will allow you to move the entire axle (or just one side of it) forward or backward.

You should also check to see why it is off. Bent brackets? Bent arms?

 

Well that's what has me puzzled is why. Im not a mechanic so "checking" these things proves difficult at best sometimes. I know I have the stock arms and it's pulled right since day one. Could it have been crooked the whole time? I can only remember hitting something in the rear maybe twice last time offroad, but didn't think about or notice damage. I will take a look and see if I notice anything obvious.

 

could find no obvious signs of anything bent or broken in the rear or front for that matter. did see this with the driveshaft though. from what ive read some think its bad, others say it happens after the lift...



i did measure my wheelbase and the passenger side is about 1/2 inch shorter

 

I will be looking at getting an alignment soon.

 

Yep, that ring of grease splattered on the undercarriage above the joint is the give-away. You will want a set of adj arms to set the pinion for the new shaft. (assuming you go aftermarket instead of replacing with a factory shaft).

And assuming nothing is bent, you will want the second set of adj arms to move that side of the axle to even it up. But if you find a bent bracket or something, you will probably want to get it fixed first.