LCA length importance
#1
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Year: 97
Model: Cherokee
Engine: 4.0
LCA length importance
I have RC fixed arms which are 16" long and purchased adjustable UCA to fix pinion/caster angle.
I just got RE 4.5" which is about 5-5.5" lift can't I just use the UCA to fix pinion angle why the need for 16 5/8th-17" LCAs if I can adjust with UCA?
Is it because with the lift the tires aren't centred properly?
Edit: so stock mounts can be shimmed Up To 3/4"?
I just got RE 4.5" which is about 5-5.5" lift can't I just use the UCA to fix pinion angle why the need for 16 5/8th-17" LCAs if I can adjust with UCA?
Is it because with the lift the tires aren't centred properly?
Edit: so stock mounts can be shimmed Up To 3/4"?
Last edited by thescreensvers; 10-02-2016 at 09:21 PM.
#2
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Year: 1993
Engine: 4.0
Kind of unclear as to what you are asking, but, if you are wondering why you are supposed to get longer LCAs with a bigger lift it's because, as the Jeep goes up the control arms pivot the axle downward and in a circular arc back, if you don't get longer arms the axle won't be centered in your wheel well.
#3
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Year: 1997
Model: Cherokee
Engine: 4.0L
I had some issues with suspension geometry before I went to adjustable control arms. For me I had a slight shake, sometimes even death wobble, with the stock arms. I had a lot of other issues going on with my geometry but overall the longer control arms did seem to solve some of my issues. Hope this helps!
#4
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use your adjustable uppers to point the pinion at the T-Case and hope for the best. The Jeep will let you know if you need longer LCA's via vibes, death wobble, creaking noises, and such.
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Year: 1990
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Engine: 4.0
One more vote for longer LCAs to center wheel in wheel well. Other than that, I don't see where it makes a difference. As far as adjustment of lower arms, I was able to shim mine 5/8" IIRC before the nut was flush with the end of the threaded shaft the shims are on. I wouldn't feel comfortable shimming mine 3/4".
In your position, I would shim the LCAs as far as possible while maintaining good thread engagement on the adjustment nuts. Then I would set the caster with the UCAs and drive it. See what happens. Remember caster and pinion angle are directly related, it is a compromise to get good caster while not screwing the pinion angle up too bad.
In your position, I would shim the LCAs as far as possible while maintaining good thread engagement on the adjustment nuts. Then I would set the caster with the UCAs and drive it. See what happens. Remember caster and pinion angle are directly related, it is a compromise to get good caster while not screwing the pinion angle up too bad.
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