CASTER 6 or 5.5???

MarkY3130

Well-Known Member
First Name
Mark
Joined
Mar 27, 2018
Messages
809
Reaction score
830
Location
Denver
Vehicle(s)
2019 JLUR
Vehicle Showcase
1
It changes the angle of your steering knuckle in relation to the ground, which changes how easy or hard it is for your steering wheel inputs (and inputs from the road) to move the tires left and right. Not enough caster will allow them to turn super easily, giving it a flighty feel and allowing bumps to shift your tires easier.





Advertisement

 

StingJLUR

Active Member
First Name
Joe
Joined
Sep 20, 2018
Messages
31
Reaction score
22
Location
Fairfield, CT
Vehicle(s)
2018 Jeep Wrangler Unlimited Rubicon - Sting Gray
Yes, that is likely the cause of your wandering. Need to shorten up the uppers or lengthen the lower control arms. (Or combo of both)
I called the shop that installed my lift and they said they set caster to 4.5 on JLs. They said the springs will be bowing at 5.5 or 6.0. Any reason why they think this? It’s a very reputable shop that does tons of JKs, JLs, and JTs.
 

MarkY3130

Well-Known Member
First Name
Mark
Joined
Mar 27, 2018
Messages
809
Reaction score
830
Location
Denver
Vehicle(s)
2019 JLUR
Vehicle Showcase
1
I called the shop that installed my lift and they said they set caster to 4.5 on JLs. They said the springs will be bowing at 5.5 or 6.0. Any reason why they think this? It’s a very reputable shop that does tons of JKs, JLs, and JTs.
They’re crazy. If all us shade tree home mechanics can figure it out I’m not sure what they bring to the table. I’m using the front rock krawler spring correction pads on mine. (Rest is Metalcloak) No bowing
 

Jerrybizzle

Well-Known Member
First Name
Jerry
Joined
Aug 28, 2018
Messages
271
Reaction score
217
Location
Idaho
Vehicle(s)
2019 JLUR
Occupation
Tech
I called the shop that installed my lift and they said they set caster to 4.5 on JLs. They said the springs will be bowing at 5.5 or 6.0. Any reason why they think this? It’s a very reputable shop that does tons of JKs, JLs, and JTs.
Running mopar lift with adjustable lowers and I’m at 6.5 one side and 6.8 on the other. No bowing for me, but I am also running the rock krawler spring pads on the front.
 

4xFUN

Well-Known Member
First Name
Mike
Joined
Dec 9, 2019
Messages
466
Reaction score
619
Location
Scottsdale AZ
Vehicle(s)
2020 2-door Rubi. 2019 Ram Longhorn 4x4
How does it drive better with more caster? What improves?? Vibrations? Shaking? Wandering?

after I installed the lift kit with 37 mien startedshaking bad when Ihit a bump ... then I had the shop set my caster higher at 6.3-6.4 and take the metal cloak steering relocation bracket as it lookedkind off flimsy...

many ride is wayyy better .. but I don’t know if it’s the caster or the Going back to stock steering stabilizer location


With caster set to 6.7L / 6.9R on my Rubi 2-door I have no vibrations or shaking and no wandering...However I have done a lot to the suspension to improve overall handling: Started with Mopar 2" lift, replaced all 8 control arms with adjustable Teraflex IR arms, (Did this to maintain OEM placement / geometry of axles after lift) replaced OEM track bar, drag link and tie rod with Steer Smarts-huge improvement, replaced OEM stabilizer with Fox 2.0 TS using Synergy track bar bolt / stud mount, added Teraflex rear track bar relocation bracket and replaced OEM rear track bar with adjustable Rancho, added a Rancho front track bar / frame support bracket-peace of mind with larger tires & wheels when wheeling hard, running 35" KO2's set to 32psi on 17"x8.5" wheels with 5.2" backspace. Overall, even on the highway it handles better than my buddies stock Rubi 4-door!
 

StingJLUR

Active Member
First Name
Joe
Joined
Sep 20, 2018
Messages
31
Reaction score
22
Location
Fairfield, CT
Vehicle(s)
2018 Jeep Wrangler Unlimited Rubicon - Sting Gray
Yes, that is likely the cause of your wandering. Need to shorten up the uppers or lengthen the lower control arms. (Or combo of both)
Lift manufacturer recommended adjusting caster from the upper arms. Opinions?
 

Roky

Well-Known Member
First Name
Roky
Joined
Oct 4, 2018
Messages
3,042
Reaction score
8,812
Location
North Central Florida
Vehicle(s)
2018 JLUR
Vehicle Showcase
1
Lift manufacturer recommended adjusting caster from the upper arms. Opinions?
Since you asked for an opinion...... imho, technically it’s supposed to be the way to do it, but I don’t like the way the wheel looks in the wheel well if you just pull top arms in. When I install a lift I use both upper and lowers to set caster and keep the wheel centered as much as possible. Here’s an example. This is MC lift with adjustable upper and fixed lowers, caster set at 6 +/-. Now some will say that looks fine , I don’t care, but I don’t have that luxury with my ocd......:(..................:)

D0AB7B8F-C624-4AB5-B315-441564D38412.jpeg
 

StingJLUR

Active Member
First Name
Joe
Joined
Sep 20, 2018
Messages
31
Reaction score
22
Location
Fairfield, CT
Vehicle(s)
2018 Jeep Wrangler Unlimited Rubicon - Sting Gray
Since you asked for an opinion...... imho, technically it’s supposed to be the way to do it, but I don’t like the way the wheel looks in the wheel well if you just pull top arms in. When I install a lift I use both upper and lowers to set caster and keep the wheel centered as much as possible. Here’s an example. This is MC lift with adjustable upper and fixed lowers, caster set at 6 +/-. Now some will say that looks fine , I don’t care, but I don’t have that luxury with my ocd......:(..................:)

D0AB7B8F-C624-4AB5-B315-441564D38412.jpeg
I definitely have the OCD. Haha. But that doesn't look bad. Here is what mine looks like currently at 4.5 caster.

Jeep Lifted.jpeg
 

Roky

Well-Known Member
First Name
Roky
Joined
Oct 4, 2018
Messages
3,042
Reaction score
8,812
Location
North Central Florida
Vehicle(s)
2018 JLUR
Vehicle Showcase
1
I definitely have the OCD. Haha. But that doesn't look bad. Here is what mine looks like currently at 4.5 caster.

Jeep Lifted.jpeg
Yep that’s where I like to see the wheel at 6 plus caster. I’d say try it. and if you don’t like it you can always fix it.....nice rig!

here’s 6.4 caster on mine.....

425C15FC-80A1-44E0-89BF-AA53580106E2.jpeg
 

MarkY3130

Well-Known Member
First Name
Mark
Joined
Mar 27, 2018
Messages
809
Reaction score
830
Location
Denver
Vehicle(s)
2019 JLUR
Vehicle Showcase
1
Lift manufacturer recommended adjusting caster from the upper arms. Opinions?
I agree with Roky. I adjust both but it can be set either way.

The benefit to adjusting both is centering the wheel at ride height. Downside is once you lengthen it, at full compression your axle will extend further forward than it would otherwise and bumpstops/spring perch dont line up as well (at stuff)

I haven’t found that to be a problem on my setup and the bumpstops are still connecting well enough.
 

drvn

Well-Known Member
Joined
Feb 9, 2020
Messages
153
Reaction score
252
Location
Indiana
Vehicle(s)
2020 Sahara Unlimited
Vehicle Showcase
1
I definitely have the OCD. Haha. But that doesn't look bad. Here is what mine looks like currently at 4.5 caster.

Jeep Lifted.jpeg
sick rig man!
I am currently achieving an upper 6 caster via adjustable lower control arms. Not probably ideal..but haven't put out the money for uppers yet.
 

SilverRubi

Well-Known Member
First Name
Daniel
Joined
Sep 4, 2019
Messages
149
Reaction score
133
Location
Kansas
Vehicle(s)
2019 JLUR
I took my caster from 5 to 6.5 and it took care of the wandering. Now I have a pretty hard pull to the left. I spun both uppers the same number of turns. I had my alignment checked before and after. The caster is where I want it but now my thrust angle is off? Assuming that's what is causing the pull. Why would adding caster cause that?
 

hoag4147

Well-Known Member
First Name
Rick
Joined
Dec 13, 2019
Messages
926
Reaction score
973
Location
DFW, Texas
Vehicle(s)
2018 JLU Sport S / GMC 1500AT 4x4
Vehicle Showcase
1
I took my caster from 5 to 6.5 and it took care of the wandering. Now I have a pretty hard pull to the left. I spun both uppers the same number of turns. I had my alignment checked before and after. The caster is where I want it but now my thrust angle is off? Assuming that's what is causing the pull. Why would adding caster cause that?
I want others more knowledgeable than me to weigh in but have read to leave passenger side a little less. Let’s say 6.5 drivers and 6.4 passenger. Seems to assist road crown differences.
 

SilverRubi

Well-Known Member
First Name
Daniel
Joined
Sep 4, 2019
Messages
149
Reaction score
133
Location
Kansas
Vehicle(s)
2019 JLUR
I want others more knowledgeable than me to weigh in but have read to leave passenger side a little less. Let’s say 6.5 drivers and 6.4 passenger. Seems to assist road crown differences.
This pull is opposite of the road crown. After the adjustment the thrust angle is out. The only thing I can think of is maybe my track bar is binding and pulling the axle?
 

Advertisement




Jim Marsh Chrysler Jeep
 



Advertisement
Top