control arm length

[the manche]

i have 4.5 inch coils 1.75 spacers up front I'm wondering what length my control arms should be i have udj upper and lowers thanks

[Motion Offroad]

LCA = Lower Control Arm

UCA = Upper Control Arm

 

Stock

LCA - 15¾"

UCA - 15"

 

2"

LCA - 16"

UCA - 15"

 

3"

LCA - 16"

UCA - 15"

 

4"

LCA - 16 3/8"

UCA - 15"

 

5"

LCA - 16 5/8"

UCA - 15¼"

 

6"

LCA - 17"

UCA - 15½"

 

7"

LCA - 17 3/8"

UCA - 15¾"

 

8"

LCA - 17¾"

UCA - 16"

 

9"

LCA - 18¼"

UCA - 16¼"

 

10"

LCA - 18¾"

UCA - 17"

 

 

For 1/2" lifts take the difference from the one above and below. So for example a 4.5" lift would be LCA - 16.5" and the UCA - 15".

[the manche]

my lca are 17 and my uca are 15.5 and my drive shaft has a harsh angle like my lowers need to be shorter than 17 to correct my pinion angle

[89flat]

http://gojeep.willyshotrod.com/ , has the correct pinion angle per the height of lift and using a angle finder you can get it dead on that is what i went by and worked awsome sitting at 5.5 inches of lift, here's the chart listed but theres a good write up here http://gojeep.willyshotrod.com/HowtoAlignment.htm

 

Diff degrees True Caster Hi Pinion True Caster Low Pinion

 

87.5 or 2.5---------6.5 ( 0-2" )------------- 9.5

87.0 or 3.0---------6.0 ( 3" lift )----------- 9.0

86.5 or 3.5---------5.5 ( 4" lift )----------- 8.5

86.0 or 4.0---------5.0 ( 5" lift )----------- 8.0

85.5 or 4.5---------4.5 ( 6" lift )----------- 7.5

85.0 or 5.0---------4.0-------------------- 7.0( 0"-2" )

84.5 or 5.5---------3.5-------------------- 6.5( 3" lift )

84.0 or 6.0 --------3.0-------------------- 6.0( 4" lift )

83.5 or 6.5 --------2.5-------------------- 5.5( 5" lift )

83.0 or 7.0---------2.0-------------------- 5.0

82.5 or 7.5---------1.5-------------------- 4.5

82.0 or 8.0---------1.0-------------------- 4

81.5 or 8.5---------0.5 ------------------- 3.5

81 or 9.0 ----------0.0-------------------- 3.0