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Old 02-19-2016, 12:51 AM
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what to do with Adjustable Lower Control Arms

I have a TF 2.5" WF most popular lift kit for my soon-to-arrive 2016 JKU RHR.

I have added the TF Monster adjustable front track bar and the TF Alpine Adjustable front lower control arms and the Northridge bolt kit.

My question concerns how to correctly set the adjustable LCAs.

It seems there are 3 main adjustments to concern yourself with.
1) Square the axle to the frame.
2) Set the front caster
3) Set the front pinion angle

I am not sure which one of these takes priority over the others.

In looking at the suspension you should be able to square the axle no matter what you need the caster or pinion angle needs to be. Is there a preferred reference point to measure to make sure the axle is squared?

So it appears that front caster and pinion angle might cause conflict perhaps? Set the caster to the right value (what vale or range should this be anyway?) and your pinion angle might be wrong (what angle is this supposed to be and how do you measure it?).

So what/how do you install and set adjustable LCA's?

I assume that the adjustable front trackbar should be installed and adjusted to center the axle under the jeep before messing with the LCA's or....?

I plan on taking it to a alignment shop after I install the lift, but I am trying to find a experienced 4x4 shop who is used to dealing with these nuances instead of a 'regular' alignment shop.


Thanks for any input.

-steve

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Old 02-19-2016, 04:18 AM   #2
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With ONE set of arms the only adjustment being made is rotation of the axle. Front lowers = pinion/caster angle. 23 1/8 should be ok at 2.5" of lift for 4.5-5° caster. Pinion is not a high concern fyi.

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Old 02-19-2016, 06:26 AM   #3
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You want caster fixed and front axle centered.

Read this: https://www.wranglerforum.com/f202/be...jk-298665.html

If you have an iPhone, download the app "angle pro". Then lay phone on top of upper ball joint and read your caster. You want 4.2 degrees. Rockkrawler said this is a good method and I checked against the alignment at the dealership is it was exactly the same.
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Old 02-19-2016, 07:30 AM   #4
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Just make sure that when you measure your caster that you take into account any pitch/grade in the floor/driveway that the Jeep is on and add/subtract accordingly.
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Old 02-19-2016, 09:24 AM
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Quote:
Originally Posted by kjeeper10 View Post
With ONE set of arms the only adjustment being made is rotation of the axle. Front lowers = pinion/caster angle. 23 1/8 should be ok at 2.5" of lift for 4.5-5° caster. Pinion is not a high concern fyi.
Quote:
Originally Posted by zimm View Post
You want 4.2 degrees. Rockkrawler said this is a good method and I checked against the alignment at the dealership is it was exactly the same.
OK, I guess 23 1/8" is the suggested starting length of the LCA's? This is measured from center of eye-to-eye I assume?

For Caster, what is better, more or less Caster Angle than the stock 4.2*? Keep in mind that this is a DD - 85% on road, 15% as my off-road exploration vehicle - not doing any rock crawling, etc - just going out looking for neat stuff to explore off-road.

Adjusting caster does directly change pinion angle, correct? You cannot change one without affecting the other - all things being equal. Is this correct?

If one angle (caster or pinion) is in range and the other is out of range how is this corrected - a different drive shaft? It appears that Caster angle is the most important, so you should adjust this to be in-range and just lift with the pinion angle, whatever that ends up being?

Since the axle is a solid, welded assembly how can caster be different from side to side? I have seen different caster from side-to-side on alignment sheets posted here.

What is the ideal range for Pinion angle and how do you measure this?




Quote:
Originally Posted by zimm View Post
You want caster fixed and front axle centered.

Read this: https://www.wranglerforum.com/f202/be...jk-298665.html

If you have an iPhone, download the app "angle pro". Then lay phone on top of upper ball joint and read your caster. You want 4.2 degrees. Rockkrawler said this is a good method and I checked against the alignment at the dealership is it was exactly the same.
I have read this thread, several times over the past year (bought the lift originally for my 2015 JK but never installed - TeraFlex swapped springs for my new JKU), but it has become so large (220+ pages) that the detailed info is not easily found.

I do have a digital angle gauge.

Sorry for the 1,000 questions, but it is the engineer in me coming out.

Thanks again.

-steve
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Old 02-20-2016, 04:44 PM
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Also, do the adjustable lower control arms give the same ride or better (compliance, brake nose dive, etc) as the correction brackets?

Just curious as the correction brackets increase separation between the upper and lower arms and conceivably could result in a better ride with reduced nose dive under braking.

Thanks.

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