Adjusting caster - JeepForum.com
 
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post #1 of 15 Old 01-10-2020, 09:52 AM Thread Starter
JoeTe
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Adjusting caster

Hi guys,
Some days ago I installed a Rough country X-flex 4" lift (short arm) kit but my car is from europe with diesel engine so really dont lift 4" just 3,2" so I added spacers of 2" so really my real lift at the moment is about 5,2" front and 4,5" rear

Is my first kit that I install so I'm not have experience with that but I just when I drive it I found death wobble and I modding caster angle and a little toe out and it is almost solved but I'm really dont happy because

Really dont know if caster angle is correct. What is the correct caster angle? or what I have to find?

Where is correct take the mesure? I have see IRO instructiosn and they messure down of C-axle and say for eliminate shimming steering that More caster give you more stability and less caster eliminate shimming



For another side Long arm of IRO instructions say that you have to "make" a line between center of rear and front axle put down of C-axle parallel but dont know if is valid to short arm too



Another thing and relative is driveline vibration I have vibrations (I dont dropped transfer case because I dont want lost off road capacibility)

Like you see I have a lot of questions...
Actually my angles are: Down C-axle: -8 degrees. Diff angle: -5
I mesure a buddy wj with 1.75" BB and Down C-axle: -5 degrees and diff angle -3

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post #2 of 15 Old 01-10-2020, 09:58 AM
007matman
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The RC X-series kit is 4" front and 3.5" rear. I would caution you from placing a puck in there as the SA kit you have really doesn't perform well over that height. (Neither for anyone else's SA kit).

When I installed mine, I just made sure that the wheel was centered in the wheel well. It was fine. I really didn't get that worked up about it. Of I remember correctly, it was about a 1/2 inch from stock.

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post #3 of 15 Old 01-10-2020, 04:18 PM
willis36
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Remember front pinion angle should always come first, castor will be what it is.
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post #4 of 15 Old 01-10-2020, 05:43 PM
007matman
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My CA's on the inside from center of bolt to center of bolt is 15 7/8"

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post #5 of 15 Old 01-10-2020, 09:18 PM
yoffer
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This might help?
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9E77BA67-A656-4704-ABA0-6D443E005586_1578716278741.jpeg  

02' Grand Cherokee Limited, 4.7 Quadra Drive
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post #6 of 15 Old 01-20-2020, 04:02 PM Thread Starter
JoeTe
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Quote:
Originally Posted by 007matman View Post
The RC X-series kit is 4" front and 3.5" rear. I would caution you from placing a puck in there as the SA kit you have really doesn't perform well over that height. (Neither for anyone else's SA kit).

When I installed mine, I just made sure that the wheel was centered in the wheel well. It was fine. I really didn't get that worked up about it. Of I remember correctly, it was about a 1/2 inch from stock.

Sent from my Pixel 3 XL using Tapatalk

Do you think is not good idea for perform 5,2" lift front and 4,5" rear with short arm? I'm noob so if you can give more info would be great. I know that long arm is a lot of better but I dont want spend more money so or I keep 5.2" and 4,5" lift or mod to keep to F 4,5" and R 4"


Thank you so much!


Quote:
Originally Posted by willis36 View Post
Remember front pinion angle should always come first, castor will be what it is.

And what is correct front pinion angle?? 0?
I have double cardan


thank you so much!

Quote:
Originally Posted by 007matman View Post
My CA's on the inside from center of bolt to center of bolt is 15 7/8"

Sent from my Pixel 3 XL using Tapatalk

Thanks so much!

Quote:
Originally Posted by yoffer View Post
This might help?

Yes help, that i guess is if you have both control arm but I just to order upper control arm and when I installed will be very useful!


thank you so much
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post #7 of 15 Old 01-20-2020, 04:21 PM
007matman
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If you're going over 4" you'll be happier with a LA setup. That's pretty much the max.

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post #8 of 15 Old 01-22-2020, 12:54 PM Thread Starter
JoeTe
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Somebody can tell me more about pinion angle set up?
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post #9 of 15 Old 01-22-2020, 01:03 PM
007matman
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Pinion angle is directly related to caster and you can't adjust one without adjusting the other.

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post #10 of 15 Old 01-22-2020, 01:22 PM
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Quote:
Originally Posted by JoeTe View Post
Somebody can tell me more about pinion angle set up?
Yes, if you have a double cardan shaft, zero degrees at the drive pinion. if you go screwing around with trying to achieve a certain castor number you will just end up with driveline vibrations. Like I said, pinion angle comes first, castor will be what it is.
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post #11 of 15 Old 01-22-2020, 02:48 PM Thread Starter
JoeTe
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Quote:
Originally Posted by 007matman View Post
Pinion angle is directly related to caster and you can't adjust one without adjusting the other.

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I know it, like willis said right now I'm trying to adjust pinion angle directly instead caster angle
Thank you so much!


Quote:
Originally Posted by willis36 View Post
Yes, if you have a double cardan shaft, zero degrees at the drive pinion. if you go screwing around with trying to achieve a certain castor number you will just end up with driveline vibrations. Like I said, pinion angle comes first, castor will be what it is.

Yes I have double cardan and I'm about 0 degrees in pinion but still have some vibration. maybe can I try to put a little more pinion angle? or just I won't have vibrations at rigorous zero degrees?


Thank you so much
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post #12 of 15 Old 01-22-2020, 07:00 PM
007matman
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I'd check your u-joints or the driveshaft balance.

Lots of folks at 4" lift and no vibes.. me included.

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post #13 of 15 Old 01-23-2020, 12:07 PM Thread Starter
JoeTe
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Quote:
Originally Posted by 007matman View Post
I'd check your u-joints or the driveshaft balance.

Lots of folks at 4" lift and no vibes.. me included.

Sent from my Pixel 3 XL using Tapatalk

But I'm 5.2" front and 4.5" rear (Real mesured). I tried two driveshaft and same


Just waiting upper control arm to finish set up and If i dont found correct set up probably go to 4-4.5" front and 3.5-4 " rear


Thank you!
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post #14 of 15 Old 01-23-2020, 12:36 PM
007matman
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You're going to have all sorts of issues running a SA 4" lift and a 2" puck.

The actual max height for a 4" RC X-series lift is 4" front and 3.5" rear.

Did you install the TC drop?

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post #15 of 15 Old 01-23-2020, 01:30 PM
willis36
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Have you tried removing the driveshaft to confirm thats the issue? If confirmed, you might drop the pinion angle one or two degrees and see if that helps. All Jeeps are different, some more picky than others.
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