Adding new control arms - Jeep Cherokee Forum

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Adding new control arms

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Old 03-10-2018, 01:29 PM
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Default Adding new control arms

2004 WJ 4.7 HO 2" spacer lift

I plan to add new control arms all the way around, including rear up ball joint and bushings.

I am going with adjustable control arms. Question is how/where do I measure to know what length to adjust the control arms. I know 2" isn't much but I'd like to learn how to do it.
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Old 03-12-2018, 08:13 PM
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There is a lift/ca length table floating around at 3 inches you should go from factory 15.76 inches to 16-16.15 inches or 16 1/8
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Old 03-13-2018, 06:18 PM
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Old 03-17-2018, 09:13 PM
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Originally Posted by riskywhiskey View Post
There is a lift/ca length table floating around at 3 inches you should go from factory 15.76 inches to 16-16.15 inches or 16 1/8
Thank you!

Forgive the stupid questions, I am new to anything to do with suspensions. So when you're talking those measurements, you are talking about the length of the control arms? Do I measure from center hole to center hole? And is it the same measurement for the front upper and lower and rear lower?
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Old 03-18-2018, 04:04 AM
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No uppers and lowers are different lengths because of pinion angle and castor if your pinion angle Is off too much you get drive line vibes if your castor is off you get death wobble wjs are good for 3-5 degrees of castor if you do a 2-3 inch lift you will be ok and not need adjustable control arms and yes the length is from eye to eye
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Old 03-27-2018, 01:59 PM
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on the back with that lift i think if you left the axle at the stock angle that would work. i downloaded an angle app on my phone and used that to adjust my rear axle. before removing the old arms i would take distance measurements from each side and also check the axle angle. to measure the angle park the jeep on a flat surface and place your phone on a flat part of the axle (there are some "O" shapes on each slide of the diff that work well, or near where the pinion is) and place a jack under the pinion area to support the axle and adjust the angle. i would replace the upper first then the bottom. if the upper ones are the same length as the stock ones it makes it easier, if not then you will have to make measurements on where that axle is relative to the body. once you get it to where you want adjust the arms and install. then take it out for a test drive.

the front i have not done yet but and am a bit foggy on how to do it but this would be my guess. i currently have solid lower arms installed but will switch over to adjustable flex arms (i broke one of my mounts one time - too much flex hence the switch). if anyone has done this before please chime in, but i am guessing you will want to do this in a similar method, take measurements and angles prior to replacing anything. then, with a jack under the pinion, replace the upper ones then the lower ones. after confirming that the axle is square with the body then check the angle as mentioned above (3-5 degrees) and make adjustments with the jack under the pinion.

like i said i have not done the front but the process above would be my guess. hopefully someone who has done this before and can share some pitfalls can provide better details.
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