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Old 01-23-2020, 07:30 PM
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Alignment help needed

Hello Everyone,

See my alignment specs attached below.

I originally had a J Spec 2.5 inch lift with fixed LCAs front and rear. Recently, I installed 37s, a Prorock 44, Teraflex HD flipped drag link and tierod, Adams drive shafts, added 3.5 inch JKS springs and Rock Krawler rear adjustable LCAs.

Now my JKU drives a bit flighty, confirmed by the caster at 5.2*

Question is do I only need adjustable front LCAs to correct the caster or should I also add adjustable UCAs? I've already emptied every pocket, I guess I could dig a little deeper!

I appreciate any input from the group.

Jim

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File Type: pdf Alignment Jan2020.pdf (279.3 KB, 15 views)
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Old 01-23-2020, 07:49 PM   #2
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Your flightiness is coming from something else... My guess is the new tires. 37's should be around 26PSI, what is your air pressure?

5.2 caster and .19 toe is right on the money...

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2012 JKU Sahara - Pro Comp LED Headlights - PRS Audio mod- SWS - GraBars - Bestop Cargo Cover
- Mopar 2" Frankenlift - Teraflex Falcon Shocks - RE TB/Brackets - JKS mount/Bilstein stabilizer -
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bumper - Yukon Gears - G2 Diff Covers - Pro Comp 8186 - Milestar Patagonia 35's - Teraflex BRK
- TORQ Locker - 1310 Driveshaft - PowerTrax Grip Pro - Full Core 4x4 Control Arms and Track Bars
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Old 01-23-2020, 08:01 PM   #3
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Thrust angle is way off and how did they adjust camber as camber is usually not adjustable unless you got adjustable ball joints or shims.
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Old 01-23-2020, 08:09 PM   #4
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Quote:
Originally Posted by onecfa1 View Post
Hello Everyone,

See my alignment specs attached below.

I originally had a J Spec 2.5 inch lift with fixed LCAs front and rear. Recently, I installed 37s, a Prorock 44, Teraflex HD flipped drag link and tierod, Adams drive shafts, added 3.5 inch JKS springs and Rock Krawler rear adjustable LCAs.

Now my JKU drives a bit flighty, confirmed by the caster at 5.2*

Question is do I only need adjustable front LCAs to correct the caster or should I also add adjustable UCAs? I've already emptied every pocket, I guess I could dig a little deeper!

I appreciate any input from the group.

Jim
Is your rear axle centered?

Quote:
Originally Posted by jadmt View Post
Thrust angle is way off and how did they adjust camber as camber is usually not adjustable unless you got adjustable ball joints or shims.
__________________
2006 LJ Rubicon - Solar Yellow - Very Stock'ish - The Press Casual LJ-R build
2012 JKU Sahara - Pro Comp LED Headlights - PRS Audio mod- SWS - GraBars - Bestop Cargo Cover
- Mopar 2" Frankenlift - Teraflex Falcon Shocks - RE TB/Brackets - JKS mount/Bilstein stabilizer -
Rugged Ridge XHD
bumper - Yukon Gears - G2 Diff Covers - Pro Comp 8186 - Milestar Patagonia 35's - Teraflex BRK
- TORQ Locker - 1310 Driveshaft - PowerTrax Grip Pro - Full Core 4x4 Control Arms and Track Bars
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Old 01-23-2020, 08:41 PM
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I know the tires aren't broken in yet with only 150 miles on them and they're at 29/28 psi. I did get to drive it with the 37s installed on the old lift and the steering was much heavier than the previous 285/75/17 Nittos. Now, with the Teraflex drag link and tierod, the steering feels very light.

I'll have to ask the shop how they changed the camber. Thanks for pointing that out.

I still have the fixed J Spec rear track bar mount with stock bar. Does the JK rear axle move as much as the front on a 3.5 inch lift? With just my eyes, the tires poke out about 1 1/4 inches on both sides.
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Old 01-23-2020, 08:52 PM   #6
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A couple comments... I don't like rear lowers of any kind without adjustable rear uppers. When you lift, your rear pinion gets worse and longer lowers just add to the pinion angle.

In the front, since you have lowers, I would just add adjustable uppers to add or subtract caster.

It's odd that you notice a large difference in steering feel with what you changed.
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2006 LJ Rubicon - Solar Yellow - Very Stock'ish - The Press Casual LJ-R build
2012 JKU Sahara - Pro Comp LED Headlights - PRS Audio mod- SWS - GraBars - Bestop Cargo Cover
- Mopar 2" Frankenlift - Teraflex Falcon Shocks - RE TB/Brackets - JKS mount/Bilstein stabilizer -
Rugged Ridge XHD
bumper - Yukon Gears - G2 Diff Covers - Pro Comp 8186 - Milestar Patagonia 35's - Teraflex BRK
- TORQ Locker - 1310 Driveshaft - PowerTrax Grip Pro - Full Core 4x4 Control Arms and Track Bars
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Old 01-24-2020, 09:15 AM
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Thanks for all the input. I'll discuss with my shop and see what they think about adjustable F/R upper CAs. For now, I'll adjust psi a bit more and see what happens.

J

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