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Old 05-03-2012, 12:08 PM   #1
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Fixed length LCAs?

Anyone running these? Thoughts?

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Old 05-03-2012, 12:29 PM   #2
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Your jeep is stock with "Fixed length" LCAs/UCAs--

You shouldn't changem, unless the LIFT KIT mfg provides em/w increased length, which will depend on the amount of lift-

I'd never usem-

Good luck

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Old 05-03-2012, 12:30 PM   #3
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= no adjustability
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Old 05-03-2012, 12:32 PM   #4
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Quote:
Originally Posted by JIMBOX View Post
Your jeep is stock with "Fixed length" LCAs/UCAs--

You shouldn't changem, unless the LIFT KIT mfg provides em/w increased length, which will depend on the amount of lift-

I'd never usem-

Good luck

JIMBO
True but lifts change stock caster angle. Would not new longer fixed LCAs help handling characteristics with the 2.5 lift? I will not go larger so this is why I was looking into them.
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Old 05-03-2012, 12:39 PM   #5
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Everybody's jeep seams to respond different.
What if the new arms set a caster number that doesn't work for you?
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Old 05-03-2012, 12:39 PM   #6
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Yes the lift will DECREASE the + front caster --


Quote:
Originally Posted by ESP View Post
True but lifts change stock caster angle. Would not new longer fixed LCAs help handling characteristics with the 2.5 lift? I will not go larger so this is why I was looking into them.
But each jeep is different and if you get "FIXED" length LCAs--they may be wrong, while ADJUSTABLE LCAs, can be adjusted to any relative caster--somewhere around 5/6° positive !!

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Old 05-03-2012, 12:41 PM   #7
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Old 05-03-2012, 01:07 PM   #8
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True dat homies. I guess its moot now but are the fixed ones less money than the adj? Which are you running jeeper?
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Old 05-03-2012, 01:26 PM   #9
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Quote:
Originally Posted by ESP
True dat homies. I guess its moot now but are the fixed ones less money than the adj? Which are you running jeeper?
Tera's

They are more expensive than most though.
Drivability is improved with them on and caster around 5
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Old 05-03-2012, 01:28 PM   #10
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ESP I got the JKS Jspec fixed arms from Northridge 4x4. They are longer than stock and they do change the geometry of the axle. Having said that, I wish I went with something else. Mainly Rock Krawler adjustables or Rusty's. The arms I got are fat, beefy, heavy and longer but they are not high clearance and they are pretty much a longer stock replacement but made from round tubing rather than square. IMO even the fixed length Synergy control arms look better than the ones I got cause they are high clearance.

I say go adjustables and don't look back.

YMMV. Just my experienced opinion.

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Old 05-03-2012, 01:45 PM   #11
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How about the Teraflex vs JKS ones? Either better or just a difference of price? I've got the JKS adj track bars and like them.
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Old 05-03-2012, 01:48 PM   #12
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Both are great I am sure just on the expensive end as far as control arms go. When I change mine I am going with either Rusty's, Clayton or Rock Krawler as they all perform great.

Edit: Also check out Metalcloak's control arms

http://www.metalcloak.com/Metalcloak...Kits-s/231.htm

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Old 05-03-2012, 01:50 PM   #13
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Teraflex... Pretty beefy
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Old 05-03-2012, 01:54 PM   #14
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The Rock Krawler front adjs are $279 and look pretty good. So if I got those and swamped them out from the stockers, what else do I need to do? I'd rather do the work my self and then take it to a place to get the numbers. Would that be safe? I guess I mean if I take off the stock arms and adj the new ones to the same length then drive it over to get a proper read on them, could I just adjust them to get a better caster angle at that point?
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Old 05-03-2012, 02:54 PM   #15
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23" from eye to eye is the general consensus here.

I forget how much over stock that is, but works for most.

I set, drove around a bit and turned the adjustment out one more turn. I think I am at 23 1/8 maybe a little more.

Last alignment check I hit 5 degrees caster
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Old 05-03-2012, 03:45 PM   #16
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Go check out Rokmen, people dont realize they make a full set of adjustable CA's with dual JJ's for the JK. Same price as the teraflex I believe.
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Old 05-03-2012, 04:48 PM   #17
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ESP you don't need to take it anywhere to get numbers. Just install one at a time on flat level ground and then go for a test drive. You can start out with the 23" eye to eye that Ken is talking about.

Are you getting an vibrations or anything to warrant your needing control arms?

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Old 05-03-2012, 06:39 PM   #18
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Originally Posted by Daniel_M View Post
ESP you don't need to take it anywhere to get numbers. Just install one at a time on flat level ground and then go for a test drive. You can start out with the 23" eye to eye that Ken is talking about.

Are you getting an vibrations or anything to warrant your needing control arms?

-Dan
I get a little vibration around speeds of about 50 mph and when going around bends in the interstate while doing this speed. They do not happen at any other time. Will adj lcas correct this? Is this the most likely candidate to the problem? FWIW the tires are perfectly balanced.
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Old 05-03-2012, 07:55 PM   #19
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Old 05-04-2012, 06:07 PM   #20
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I've heard about these but I don't want to limit ground clearance. I also think that you would run into the same problem with these as you would with fixed LCAs. If they don't improve the angle all the way or correctly then your stuck with no adjustability.

The guys from Krawl emailed me today with some info on their adj arms.
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Old 05-04-2012, 07:45 PM   #21
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Quote:
Originally Posted by ESP

I've heard about these but I don't want to limit ground clearance. I also think that you would run into the same problem with these as you would with fixed LCAs. If they don't improve the angle all the way or correctly then your stuck with no adjustability.

The guys from Krawl emailed me today with some info on their adj arms.
Exactly ..... My friend runs them and loves them, but I still would pass for adj CA's
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Old 05-04-2012, 11:11 PM   #22
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Quote:
Originally Posted by ESP View Post
True but lifts change stock caster angle. Would not new longer fixed LCAs help handling characteristics with the 2.5 lift? I will not go larger so this is why I was looking into them.

Very bad idea.

what may work on my jeep may not work on yours. If getting control arms do it right the first time Johnny joint control arm that is adjustable. Buy once and cry once
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Old 05-04-2012, 11:20 PM   #23
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Originally Posted by ESP View Post
The Rock Krawler front adjs are $279 and look pretty good. So if I got those and swamped them out from the stockers, what else do I need to do? I'd rather do the work my self and then take it to a place to get the numbers. Would that be safe? I guess I mean if I take off the stock arms and adj the new ones to the same length then drive it over to get a proper read on them, could I just adjust them to get a better caster angle at that point?
I highly suggest something with johnny joint. Currie (john currie, hes the one that made the johnny joints) or teraflex (uses johnny joints) I runny Johnny joints.

You might as well pick up a rear uppers as well because your rear driveshaft pinion angle with a 2dr is more sever

There is a much easier way of doing it, you'll have to see the way I do it. Kinda hard to explain unless you've messed with pinion angles before.

Quote:
Originally Posted by ESP View Post
I get a little vibration around speeds of about 50 mph and when going around bends in the interstate while doing this speed. They do not happen at any other time. Will adj lcas correct this? Is this the most likely candidate to the problem? FWIW the tires are perfectly balanced.
Does the vibration go away as your increase speed? does the whole jeep shake? It's probably drive shaft vibration.

Quote:
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There is always the right way, ok way, wrong way to do things. This happens to be board line wrong way.
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Old 05-05-2012, 03:36 AM   #24
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Quote:
Originally Posted by Djstorm100

I highly suggest something with johnny joint. Currie (john currie, hes the one that made the johnny joints) or teraflex (uses johnny joints) I runny Johnny joints.

You might as well pick up a rear uppers as well because your rear driveshaft pinion angle with a 2dr is more sever

There is a much easier way of doing it, you'll have to see the way I do it. Kinda hard to explain unless you've messed with pinion angles before.

Does the vibration go away as your increase speed? does the whole jeep shake? It's probably drive shaft vibration.

There is always the right way, ok way, wrong way to do things. This happens to be board line wrong way.
That is the first time I heard of rear uppers for a 2 door??

ESP mentioned "bends" I noticed this when I still had the 32's mounted.

I have a vibe at 60 but lessens with higher speed. I chalked it up as the tires that can't be perfectly balanced.
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Old 05-05-2012, 03:58 AM   #25
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Just did some googling on rear pinion angle.
A 4 door is more forgiving, had it backwards.
Huh..... I should look into this more
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Old 05-05-2012, 08:41 AM   #26
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I had new fixed length ones on my lift. If you followed the drama and problems I had with mine..... bad idea in my opinion.
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Old 05-05-2012, 08:42 AM   #27
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Just did some googling on rear pinion angle.
A 4 door is more forgiving, had it backwards.
Huh..... I should look into this more
Yup, 4-Door you generally don't have to worry about pinion. 2-Doors on the other hand, after 3" (I've done a lot of research ha!) you might need to watch it.
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Old 05-05-2012, 08:49 AM   #28
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Don't forget--with a 2dr/4dr, any time you lift above 1", you'll alter the alignment settings and when you install either longer fixed LCAs/adj LCAs--you change the + caster/+camber and pinion angle, besides reducing the toe-in (a little)-

A lift isn't just a simple bolt-on, drive away mod-

Smokemifyougotem-

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Old 05-05-2012, 12:13 PM   #29
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On a two door, 07-11, when you have more then 3+" on your JK you will more than likely replace the rear shaft first and need the rear.upper control arms to correct pinion angle.
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Old 05-05-2012, 01:02 PM   #30
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Quote:
Originally Posted by chris.george

Yup, 4-Door you generally don't have to worry about pinion. 2-Doors on the other hand, after 3" (I've done a lot of research ha!) you might need to watch it.
Interesting. Don't think I am over 3" but it does seem a little steep.

How would someone know the difference between driveline vibes and tire vibes?

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