Lower control arm - JeepForum.com
 4Likes
  • 1 Post By Timo_90xj
  • 3 Post By Timo_90xj
 
LinkBack Thread Tools
post #1 of 9 Old 08-02-2021, 12:47 PM Thread Starter
dlk59
Registered User
1993 ZJ 
 
Join Date: Jun 2021
Posts: 10
Garage
Lower control arm

Looking through the forums today I noticed the lower control arms on another ZJ. I then referenced my maintenance manual. I believe that some time in the past my lower control arms were installed upside down. U portion is facing down. Has anyone else ever seen this? Vehicle tracks great, steering is good, etc... Is this anything to worry about?

dlk59 is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 08-02-2021, 12:58 PM Thread Starter
dlk59
Registered User
1993 ZJ 
 
Join Date: Jun 2021
Posts: 10
Garage
Let me clarify a bit --- installed with U down ---- manual shows a solid bar not a rolled steel U with flanges ones on truck. Looking at it it looks like it might hold mud where as if flipped over it would not. Do not know if these are original or aftermarket (no lift). Parts for sale look like what is installed - are not designated Left or right.
Attached Files
File Type: pdf lower control arm.pdf (854.0 KB, 13 views)
dlk59 is offline  
post #3 of 9 Old 08-02-2021, 02:27 PM
kg6mov
Hears the voices
 
kg6mov's Avatar
1996 ZJ 
 
Join Date: Nov 2012
Location: Cupertino
Posts: 16,463
Factory arms are stamped steel u shapes like what you're describing. The manual doesn't show the detail, but the top of the arm should basically look like the picture. The open side should be down towards the ground.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
kg6mov is offline  
 
post #4 of 9 Old 08-02-2021, 02:31 PM
yjsaabman
Registered User
1930 CJ2 
 
Join Date: Mar 2021
Location: Elizabethtown
Posts: 246
Quote:
Originally Posted by kg6mov View Post
Factory arms are stamped steel u shapes like what you're describing. The manual doesn't show the detail, but the top of the arm should basically look like the picture. The open side should be down towards the ground.
This. Stamped steel is the norm. It's cheap and it's strong enough for basic use.

Sent from my SM-G970U using Tapatalk
yjsaabman is offline  
post #5 of 9 Old 08-02-2021, 05:21 PM
PolkaPower
Registered User
 
PolkaPower's Avatar
1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss
Posts: 23,684
They fold like paper on any hard surface off road...


Sent from my iPhone using Tapatalk
PolkaPower is offline  
post #6 of 9 Old 08-02-2021, 06:46 PM
kg6mov
Hears the voices
 
kg6mov's Avatar
1996 ZJ 
 
Join Date: Nov 2012
Location: Cupertino
Posts: 16,463
Yup


The front uppers are worse, bend then fatigue and break.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
kg6mov is offline  
post #7 of 9 Old 08-02-2021, 10:33 PM
Timo_90xj
Web Wheeler
 
Timo_90xj's Avatar
1998 ZJ 
 
Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
Posts: 11,106
As mentioned, all eight OEM control arms are stamped/ pressed steel, U- shaped. Installed with the solid side up, open down. Yes, they fold like a taco if you go wheeling. They work for light wheeling on stock- height Jeep, that's about it.

That being said, the OEM control arms are actually supposed to fold like that - in an accident folding prevents the arms from penetrating into the cabin, or somewhat prevents them from getting into gas tank. In smaller accidents like driving into a ditch, the arms fold instead of bending the frameside brackets.
With aftermarket arms, all sorts of funky things can and do happen when the arms will not fail and the weak link is elsewhere in the suspension.
yjsaabman likes this.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
Timo_90xj is offline  
post #8 of 9 Old 08-03-2021, 01:41 PM Thread Starter
dlk59
Registered User
1993 ZJ 
 
Join Date: Jun 2021
Posts: 10
Garage
As they look relatively new (compared to rear), still mostly black, no bends or visible damage like in kg6mov pics, or drivability issues ----- I guess I will spend a day this weekend swapping them correct side up (if bushings look good still). My ZJ is a nice old stock equipment ride with light off-road use, but I'd hate for winter slide into the ditch or curbs to damage the attachment points. Thanks for the feedback and discussion!
dlk59 is offline  
post #9 of 9 Old 08-03-2021, 01:45 PM
Timo_90xj
Web Wheeler
 
Timo_90xj's Avatar
1998 ZJ 
 
Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
Posts: 11,106
Remember to tighten all CA bolts with the full weight of vehicle on axles, suspension at ride height.
If you tighten them when axles are drooping, CA bushings are binding and under rotational tension at ride height -> they will fail fairly quickly.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
Timo_90xj is offline  
Reply

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











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



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