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Old 09-13-2019, 05:05 PM
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Why does my rear JK Spring coil have an arc?

I had a lift done and one of the rear JKS coil seems to have an arc.... the opposite spring seems fine.... Was it installed properly? please provide some insights....

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Old 09-13-2019, 05:10 PM   #2
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Do you have adjustable control arms? If so the axle is moved back to center the tire in the wheel well and the spring bends accordingly. If not, its still a case of moving one thing in one direction and everything else moves or bends along with it.


Is the top of the spring seated in the perch evenly?

You can buy wedges that go under the spring to tilt it forward and straighten it out.

Also, is the spring coming in contact with the track bar? It looks pretty close in the pics, that's another thing to check.

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Old 09-13-2019, 05:12 PM
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I have stock control arms in rear.... Is it possible the wrong spring has been installed? It is 2-1/2" lift.….
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Old 09-13-2019, 05:20 PM   #4
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I have stock control arms in rear.... Is it possible the wrong spring has been installed? It is 2-1/2" lift.….

Is your lift just springs and shocks? It looks like the spring is compressed and bulging back a bit, like there might be something restricting in from sitting upright.

Is your rear axle off center? You can look where your tire treads line up with the fender flare. Your track bar could be pulling that side down.
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Old 09-13-2019, 05:23 PM
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JKS Track Bar bracket was installed also.....
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Old 09-13-2019, 05:29 PM   #6
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There are a few things that can contribute to this. The first is making sure the springs are correctly seated. Each spring has two ends. Each end winds up in a certain way. How the end is positioned on the spring seat can affect how the spring sits.
Next, as the axle moves down away from the chassis, due to the nature of the control arms, the axle housing rotates. This can cause the spring seat to no longer face directly back up towards the top spring seat. If the two spring seats don't point at each other the spring can have some bow to it.
Some vendors sell wedges for that lower rear spring seat that can correct that bow. The basically point the bottom spring seat back towards the top spring seat.
As long as the bow is not too bad, and as long as the spring does not contact anything else due to the bow, it isn't really a problem. But if it concerns you, you can either install some wedges or adjust the control arms to rotate the axle so the the lower spring seat is point closer towards the upper spring seat. But first make sure both rear springs are correctly oriented.
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Old 09-13-2019, 05:32 PM
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You can see in the pics that the seats are not facing each other.... How do I check to see if springs are correctly oriented?
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Old 09-13-2019, 05:41 PM   #8
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There's a notch in the spring seat that the end of the coil fits into.
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Old 09-13-2019, 05:46 PM
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Both ends?
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Old 09-13-2019, 05:51 PM   #10
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Both ends?

At least on the bottom, axle side. And it fits up against the notch, not really in it. Once one side is seated, the other side should follow.
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Old 09-14-2019, 02:13 AM   #11
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Old 09-14-2019, 05:57 AM   #12
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I have these also on mine. Easy to install.
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Old 09-14-2019, 06:43 AM   #13
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At least on the bottom, axle side. And it fits up against the notch, not really in it. Once one side is seated, the other side should follow.
Earlier this year I installed a spacer lift - there are nothes in the front spring seats, but I saw nothing on the rear. Am I wrong here, I recall searching to see if there was a particular way the rear springs should fit and did not find anything.
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Old 09-15-2019, 12:51 AM   #14
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Looks like the axle is too far forward and pinion angle too high. Is the rear drive shaft inline with the pinion?

When doing a lift of 2"+ with stock arms, the axle will move toward the arms. The taller spring changes the radius of how the axle articulates. Because the stock arms are designed for stock height, axle will rotate back, causing spring to bow. Quick fix before going full set of adjustable arms, are spring correction wedges. These will take some of the bow out.

Rear Coil Spring Correction Wedges - Rock Krawler Suspension
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Old 09-15-2019, 12:13 PM
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Looks like the axle is too far forward and pinion angle too high. Is the rear drive shaft inline with the pinion?

When doing a lift of 2"+ with stock arms, the axle will move toward the arms. The taller spring changes the radius of how the axle articulates. Because the stock arms are designed for stock height, axle will rotate back, causing spring to bow. Quick fix before going full set of adjustable arms, are spring correction wedges. These will take some of the bow out.

Rear Coil Spring Correction Wedges - Rock Krawler Suspension
Rear drive shaft/pinion inline..... No
The bow is more pronounced on passenger side.... Driver side not too noticeable....
Could the track bar be an issue?
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Old 09-16-2019, 04:48 PM
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I spoke with JKS today..... There should not be any bow with my 2-1/2 lift.... They suggest rotating the coil 180 degrees.... I also went back to the JSPEC lift instructions... They specifically instructed to mount the springs in a certain orientation... The upper cut end of the coil should at the 6 o'clock position (Aft)… The shop that did the lift did not do that... They did not read the instructions.... He also mentioned that with my lift, wedges should not be required....
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Old 09-16-2019, 05:01 PM   #17
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That should be easy enough to adjust, you don't have to drop the axle low enough to remove them just need enough to spin them.

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