How accurate is this Arm Length Chart???
Thread Starter
CF Veteran
Joined: May 2009
Posts: 1,471
Likes: 1
From: Columbus, Ohio
Year: 1996
Model: Cherokee
Engine: 4.0L
Ok well then drop brackets are if its real bad if its not that bad or not much worse than now it wont have brackets. SO ill just have to do it with uppers for now and see what its like
CF Veteran
Joined: Jul 2011
Posts: 4,521
Likes: 1
From: JOCO
Year: 1999
Engine: 4.0 Inline 6
I had 4.5 with 16" rc lowers and stock uppers and my angle was off. I installed rc's drop brackets and now my angle is perfect. Arms are parallel with the road like stock and coils sit perfect. Still at 4.5 and it rides great. Needed a knew track bar so my IRO trackbar is coming. But just with the drop brackets it solved my problems!!
Newbie
Joined: Nov 2021
Posts: 2
Likes: 0
Model: Cherokee (XJ)
99 xj 3in lift
Im doing the jump from 3" to 4.5-5". I got new lower arms from RC when I got my lift. They measure 16.5". And I have stock Uppers. I have this chart that gives you a good starting point but how accurate is it? Can I do the jump With the arms I got? I havent shimmed the lowers so i know i can shim them if needed. Im getting an SYE and shims. Longer brake lines, But i dont know if i need arms.
Lift...........Lower Control Arms/Upper Control Arms
********Decimal**Fraction**Decimal**Fraction
Stock........15.75.......15 ¾........15.00.......15
2”.............15.92.......16............14.88.... ...15
3”.............16.09.......16............14.92.... ...15
4”.............16.33.......16 3/8......15.03.......15
4.5”..........16.47.......16 ½........15.11.......15
5”.............16.62.......16 5/8......15.21.......15 ¼
6”.............16.97.......17............15.44.... ...15 ½
7”.............17.36.......17 3/8......15.74.......15 ¾
8”.............17.81.......17 ¾........16.09.......16
9”.............18.30.......18 ¼........16.50.......16 ½
10”...........18.82.......18 ¾........16.96.......17
Lift...........Lower Control Arms/Upper Control Arms
********Decimal**Fraction**Decimal**Fraction
Stock........15.75.......15 ¾........15.00.......15
2”.............15.92.......16............14.88.... ...15
3”.............16.09.......16............14.92.... ...15
4”.............16.33.......16 3/8......15.03.......15
4.5”..........16.47.......16 ½........15.11.......15
5”.............16.62.......16 5/8......15.21.......15 ¼
6”.............16.97.......17............15.44.... ...15 ½
7”.............17.36.......17 3/8......15.74.......15 ¾
8”.............17.81.......17 ¾........16.09.......16
9”.............18.30.......18 ¼........16.50.......16 ½
10”...........18.82.......18 ¾........16.96.......17
CF Veteran
Joined: Aug 2018
Posts: 1,900
Likes: 345
From: Idaho
Year: 89
Model: Cherokee (XJ)
Engine: Peddles
Arms need adjusted for lenth from stock 2" 3" 4" 5" 6"
Passed 3" castor and pinion angle start contradicting eachother
Youl be riding a fine line of enough castor to drive straight down the rd and a decentish pinion angle.
The better the castor the worse the pinion angle.
changing arm lenhth .5" will virtually see no change in either castor pinion angle
Drop bracketd are must passed 3" id never recommend running fixed arms.
id also trust zero arm lenght charts.
I want to locate the axle on Jack stands correctly under the jeep and fab the arms to these numbers. I do not want arms pointing hard at the ground
You are correct it will ride like crap like most all cookie cutter jeeps
Its like McDonalds is spitting jeeps out the drive through they all taste like **** but we all keep buying there crap
Passed 3" castor and pinion angle start contradicting eachother
Youl be riding a fine line of enough castor to drive straight down the rd and a decentish pinion angle.
The better the castor the worse the pinion angle.
changing arm lenhth .5" will virtually see no change in either castor pinion angle
Drop bracketd are must passed 3" id never recommend running fixed arms.
id also trust zero arm lenght charts.
I want to locate the axle on Jack stands correctly under the jeep and fab the arms to these numbers. I do not want arms pointing hard at the ground
You are correct it will ride like crap like most all cookie cutter jeeps
Its like McDonalds is spitting jeeps out the drive through they all taste like **** but we all keep buying there crap
Last edited by EvanM; Nov 22, 2021 at 07:44 PM.
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