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Unread 05-23-2010, 08:10 PM   #1
champelite210
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TJ adj. control arm length

I know there is a link on here telling what the lowers and front uppers should be for so much lift but all I could find was one for an XJ. Are they the same? If not any one no where it is or how long they need to be for RE 3.5 springs? Thanks

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Unread 05-24-2010, 05:29 AM   #2
njbowhntr
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Just crawled out from under jeep.

Uppers = 15 1/2" center bolt to center bolt
Lowers = 17 3/16" " "

The jeep was just aligned by OK4WD in March.
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Last edited by njbowhntr; 05-24-2010 at 06:22 AM.. Reason: added measurements
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Unread 06-18-2010, 10:20 AM   #3
champelite210
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Found a link that said about 16 1/2 for the lowers at 4" of lift. Is there any problems that occur if you run them any longer. I've heard some talk about the main thing is having the tire centered in the wheel well. Any opinions?
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1998 TJ, 4.0 HO, 5 speed, 3.5" RE Super Flex Adj SA lift, AA SYE, Currie steering, 4.88 Gears, 8.8 Rear with Eaton E-Locker, HP Dana 30 with Detroit locker and chromoly shafts, 36x12.5x15 TSL-SX, TNT Customs front 3.5 fenders, XRC rear crusher corners with 3.5 flare, A to Z rock sliders, PSC steering pump PSC steering Bx, XRC 8000 winch.
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Unread 06-18-2010, 10:37 AM   #4
glockster
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My RE adj lowers are set at 16" center to center. 1/4" longer than stock. This is also the length of the RE fixed lowers for their 3.5" or 4.5" springs. No real need that I am aware of to go any longer. Currie uses the stock length of 15.75" on their 4" lift and that worked real well on my 97 tj.
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Unread 06-18-2010, 10:41 AM   #5
Coils Rule
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there all going to be a little diffrent the pinion angle is what is important
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Unread 06-18-2010, 10:44 AM   #6
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Quote:
Originally Posted by Coils Rule View Post
there all going to be a little diffrent the pinion angle is what is important
This.


Some people extend their lowers out as much as they can get away with to cheat a little extra wheelbase. The uppers will all be different to accurately set your pinion angle.
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Unread 06-18-2010, 10:44 AM   #7
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The most important thing about control arm length is making sure everything clears. You have to check it at full compression also, not just ride height. If you only drive it on the street you may get away with centering the wheel in the wheel opening, but not if you take it offroad much.
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Unread 06-18-2010, 10:51 AM   #8
Coils Rule
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I should have elborated a little. Your not trying to point the pinion at the output shaft like you would with your rear end you want to "flatten out" you pinion angle to get the correct caster/camber. Looking at mine by eye ball it is almost level maybe even slightly down.
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Unread 06-18-2010, 10:59 AM   #9
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I am re setting my lowers/uppers soon, and I was going to set the lowers at 15 3/4 mabe 16, then the uppers too 13 1/2. Most likely I will not used exactly 13 1/2 for my uppers since my main focus is just getting the pinion angle back in alignment. If i were you I set the lowers to 16, and then just focus on getting the pinion angle correct, just make sure you stay within the boundaries of the control arms and how far they can be adjusted.
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Unread 06-18-2010, 12:38 PM   #10
champelite210
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Well the 1st reply I got said 17.5 which I thought was a little much unless he's comp cut or has extended wheel well openings. I'm gonna set it up for about 16 1/2 and see how everything clears. Thanks for the replys. Once I get this done I'm gonna submit it for Tj of the month. It's gonna be sweet. It's based of of Redlyners rig.
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1998 TJ, 4.0 HO, 5 speed, 3.5" RE Super Flex Adj SA lift, AA SYE, Currie steering, 4.88 Gears, 8.8 Rear with Eaton E-Locker, HP Dana 30 with Detroit locker and chromoly shafts, 36x12.5x15 TSL-SX, TNT Customs front 3.5 fenders, XRC rear crusher corners with 3.5 flare, A to Z rock sliders, PSC steering pump PSC steering Bx, XRC 8000 winch.
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Unread 06-18-2010, 12:56 PM   #11
Wheelin98TJ
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16.5" might be a bit long.

Especially in the rear with your 8.8 axle.

You will likely run in to clearance issues with the diff cover and the gas tank skid.
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Unread 06-18-2010, 01:32 PM   #12
LDO
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I was told from Rusty's with their adj lowers and my 3" lift the front should be set to 16.5
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Unread 06-18-2010, 03:04 PM   #13
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There isn't any EXACT length. You need to know enough about your constraints to set the arms correctly for your setup. Ideally, you want to maximize wheelbase while preventing contact anywhere @ full bump all while running proper pinion/caster angles. It can come down to a game of fractions of an inch. If you don't care and just want to set the arms and go, set the lowers @ 16", maybe a hair more and set the uppers for pinion angle in the rear and find a good mix of pinion/caster up front.
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Unread 03-07-2011, 09:53 AM   #14
epeck87
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i have 4" suspension lift and my lowers are at 16 which is perfect for me. the uppers will vary for caster/pinion angle like most others have already said
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Unread 03-07-2011, 11:57 AM   #15
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Quote:
Originally Posted by epeck87 View Post
i have 4" suspension lift and my lowers are at 16 which is perfect for me. the uppers will vary for caster/pinion angle like most others have already said
Because I'm sure, 9 months later, he was still trying to figure this out.
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