cj7 caster angle - what should it be? - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 41 Old 08-10-2010, 06:16 PM Thread Starter
dirtdonthurt
Registered User
1985 CJ7 
 
Join Date: Feb 2010
Location: Baton Rouge
Posts: 54
cj7 caster angle - what should it be?

I just finished building my cj7 and I feel like it's wandering and not returning to zero like it should. Everything is tight. I have rear factory yj springs up front with a soa lift. I welded the perches parallel to the ones on the bottom. The upper ball joint is a little behind the lower like its supposed to, but what should the angle be? I'm running 35" tires. I was thinking about making some taller spring mounts to get some more angle, plus get a little more height that i need in the front. Has anyone ever done it this way? What are your opinions?

I know I'm having a bump-steer issue too. Im running a factory pitman arm with an offset drag link. Everything runs under the springs. Could this be causing all of the problems? I know a ton of people have done this before so I'm hoping someone on here can help me out...

dirtdonthurt is offline  
Sponsored Links
Advertisement
 
post #2 of 41 Old 08-10-2010, 06:28 PM
SlikRic
Muddin Maniac
 
SlikRic's Avatar
1983 CJ7 
 
Join Date: Jan 2008
Location: North Port, Florida
Posts: 3,125
http://www.jeepforum.com/forum/f8/wh...-loose-445430/

From the stickie section of this Forum.

United States of America
Born: July 4, 1776
Died: Nov 4, 2008
SUICIDE
SlikRic is offline  
post #3 of 41 Old 08-10-2010, 08:21 PM
gojeepin
Registered User
1983 CJ7 
 
Join Date: Feb 2006
Location: Indianapolis
Posts: 3,441
Do you know what your caster angle is? You should aim for 5* to 8* positive caster.

Also, an offset draglink doesn't help with bump steer. It's really only for clearing components, which is what you need with your setup anyway. A drop pitman arm (or high steer knuckles) will help the bump steer issue.

Vibration? Bump steer? Wandering? Read the article (sticky) on Steering, suspension, and driveline.
gojeepin is offline  
post #4 of 41 Old 08-10-2010, 08:31 PM Thread Starter
dirtdonthurt
Registered User
1985 CJ7 
 
Join Date: Feb 2010
Location: Baton Rouge
Posts: 54
hey, thanks for the reply. i measured it a lil while ago. its about two degrees. i'm thinking seriously about welding on some taller spring mounts for the fixed end.

and yea i know that about the offset drag link. i need to do something different there too. i think im going to tackle the caster issue first.
dirtdonthurt is offline  
post #5 of 41 Old 08-10-2010, 08:50 PM
MikeMCJ
Registered User
1951 M-38 
 
Join Date: Oct 2008
Posts: 514
here's the basics about what a drop pitman can do

http://www.quadratec.com/jeep_knowledgebase/article-68.htm

this from a 76 owner's manual. you can't be too far off of this for caster. pretty sure your camber should be closer to zero (OEM power
steering and radials)
Attached Thumbnails
front end specs.JPG  

Last edited by MikeMCJ; 08-10-2010 at 09:01 PM.
MikeMCJ is offline  
post #6 of 41 Old 08-10-2010, 09:33 PM
foggybottombob
Registered User
1984 CJ7 
 
Join Date: May 2008
Location: Monument Colorado
Posts: 5,840
The CJ7 from the 80's had +6 degrees of caster.
foggybottombob is offline  
post #7 of 41 Old 08-10-2010, 09:44 PM
SlikRic
Muddin Maniac
 
SlikRic's Avatar
1983 CJ7 
 
Join Date: Jan 2008
Location: North Port, Florida
Posts: 3,125
Try here:

http--www.civilianjeep.info-84-86FSM-CJ-FSM-84to86.pdf

United States of America
Born: July 4, 1776
Died: Nov 4, 2008
SUICIDE
SlikRic is offline  
post #8 of 41 Old 08-11-2010, 02:02 AM
80cj
Web Wheeler
 
80cj's Avatar
1980 CJ5 
 
Join Date: May 2002
Location: Hawaii
Posts: 6,359
I hate to dispute the FSM but my CJ-5 drives a lot better with 6 degrees of caster. From the factory it was only 2 degrees and it wandered all over the road. I installed 4 degree steel shims and it made a big improvement.
80cj is offline  
post #9 of 41 Old 08-11-2010, 07:28 AM
MikeMCJ
Registered User
1951 M-38 
 
Join Date: Oct 2008
Posts: 514
Quote:
Originally Posted by foggybottombob View Post
The CJ7 from the 80's had +6 degrees of caster.
is that from the shop manual?
MikeMCJ is offline  
post #10 of 41 Old 08-11-2010, 07:35 AM
foggybottombob
Registered User
1984 CJ7 
 
Join Date: May 2008
Location: Monument Colorado
Posts: 5,840
That was in my Chilton manual and I have read that 6 degrees many times over the years on this forum and other places online. The 6 degrees number is the only one I had ever seen before this thread.
foggybottombob is offline  
post #11 of 41 Old 08-11-2010, 08:28 AM
MikeMCJ
Registered User
1951 M-38 
 
Join Date: Oct 2008
Posts: 514
OK thanks. I asked because my Haynes doesn't give specs, it only explains what caster/camber is and the alignment tools required are out of reach of what a "home mechanic" would have. Just seems to me that 6 is a preference and not a factory specification. Once you get away from the factory spec other things like pinion angle should also be factored in. 80cj's is nice and low (I like that setup), but once you start going twice the factory caster spec and then add a big lift you will be getting into pinion angle problems.
MikeMCJ is offline  
post #12 of 41 Old 08-11-2010, 08:30 AM
foggybottombob
Registered User
1984 CJ7 
 
Join Date: May 2008
Location: Monument Colorado
Posts: 5,840
When you get to a high lift you have to turn the inner knuckles. I have done that twice on mine over the years.
foggybottombob is offline  
post #13 of 41 Old 08-11-2010, 08:50 AM
MikeMCJ
Registered User
1951 M-38 
 
Join Date: Oct 2008
Posts: 514
yes, I agree. I'm not putting that much into to my D30 and don't have plans for something like what you've done (44s), so I'm trying to work within the limits of not turning the inner knuckles. That's why I set my caster at 3
MikeMCJ is offline  
post #14 of 41 Old 08-11-2010, 10:32 AM
gojeepin
Registered User
1983 CJ7 
 
Join Date: Feb 2006
Location: Indianapolis
Posts: 3,441
It's not surprising that a '76 model required less caster... for the same reason most Scout axles have 0* caster.

Unlike Europe and Japan, American tire makers stayed with bias ply tires well into the '70s. Because of how a bias ply tire behaves, the contact patch actually moved backward at speed and required less caster.

Vibration? Bump steer? Wandering? Read the article (sticky) on Steering, suspension, and driveline.
gojeepin is offline  
post #15 of 41 Old 08-11-2010, 10:42 AM
Chewtoy
Registered User
1976 CJ5 
 
Join Date: Jul 2009
Location: Post Falls
Posts: 926
Garage
I put 4 deg shims on my Dana 30 to move my caster from ~2 to ~6 and it made a world of difference on my '76 CJ5. Much less wander.

With a great Jeep comes an empty wallet.
Chewtoy is offline  
Reply

Tags
camber , caster , steering alignment , steering caster , toe in , toe out

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
How do measure caster angle? scarlett Jeep CJ Forum 3 05-23-2009 05:40 AM
Another Caster angle questions Dad03 Jeep CJ Forum 1 02-23-2009 06:43 PM
caster angle ? drunkenrich Jeep CJ Forum 2 02-11-2008 07:13 AM
Checking caster angle... 79cj7reny Jeep CJ Forum 5 11-24-2007 07:14 PM
Caster angle question jode Jeep CJ Forum 8 01-23-2007 04:41 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome