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Old 03-26-2016, 10:03 AM
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Rear end twist

Would anyone know what would cause the rear end to twist to the right when accelerating and twist left when decelerating? I suspect that I need a 4 wheel alignment. It is noticeable at all speeds.

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Old 03-26-2016, 10:05 AM   #2
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Bad bushings in the control arms?

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Old 03-26-2016, 10:14 AM   #3
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Bad bushings in the control arms?
^This. Mine did it badly when my cheapo previous control arm bushings disintegrated.
Have someone rock the jeep back and forth while it is in park or 1st gear.
Look at your rear arms and pinion. You should be able to see movement if your bushings are shot.
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Old 03-26-2016, 10:57 AM
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I already changed the lower control arm bushings on the passenger side front and rear. The driver side bushings were tight or seemed to be.
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Old 03-26-2016, 11:01 AM
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I measured center of axle to center and one side was 1/2 inch longer.
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Old 03-26-2016, 11:45 AM   #6
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I already changed the lower control arm bushings on the passenger side front and rear. The driver side bushings were tight or seemed to be.
Well, from my experience, something is moving causing what you describe during acceleration and deceleration.
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I measured center of axle to center and one side was 1/2 inch longer.
That would be the track bar's job to center the axles. If you have any lift other than stock height, your axles will be off perfect center. How much depends on how much lift. Adjustable track bars are the fix, but most don't bother with a lift 2" or less.
I just lived with the off center axles while I had a 2" spacer lift, and didn't have any lane darting issues.
Could be rear track bar bushings gone bad causing your problem. Just guessing.
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Old 03-26-2016, 09:21 PM
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Thanks for the help, I will try a new track bar. I just bought the jeep, he put a 4 in. lift on it. So I could be that he didn't think about
the track bar.
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Old 03-26-2016, 09:37 PM   #8
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Off center alignment issues with a lift is one thing, but movement right or left is play somewhere. My guess is drivers side bushings.
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Old 03-26-2016, 09:51 PM   #9
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That would be the track bar's job to center the axles. .
What the OP is saying is, his wheelbase is longer on one side.
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Old 03-26-2016, 10:54 PM   #10
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I measured center of axle to center and one side was 1/2 inch longer.
Center of axle to center of what? Fixed control arms or adjustable? And if you change one side, you should change the other side. Change them all. Don't be that guy. You'll be chasing problems forever otherwise. If you are going to rule something out, then rule it out 100%.
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Old 03-26-2016, 10:58 PM   #11
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I used a 3 plane 360* laser and a tape measure to square my axles when I installed my control arms a while back. I'd be getting some measurements to see exactly what was up before I bought or adjusted anything, but then again I am fairly particular about the operating condition of my machines, to a fault at times.
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Old 03-26-2016, 11:44 PM   #12
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I already changed the lower control arm bushings on the passenger side front and rear. The driver side bushings were tight or seemed to be.
How about the uppers? Also check for broken welds and/or bent upper and lower control arm brackets on both the axle and frame.
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Old 03-27-2016, 12:23 PM   #13
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Control arm bushings or broken bracket like stated above would be my 1st educated guess. I drove a TJ with shot control arm bushings, same symptoms.
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Old 03-27-2016, 10:29 PM
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Center of axle to center of axle. Fixed Tera flex control arms. I jacked up front and rear , that's how I found the control arms on passenger side loose. I found in previous owners receipts that the track bar was replaced. I see your point about changing all the bushings on control arms. Wilco

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