What is Difference between SPOA & SPUA Springs? - JeepForum.com

 
LinkBack Thread Tools
post #1 of 10 Old 04-02-2013, 04:46 PM Thread Starter
schaan
Registered User
1997 TJ Wrangler 
 
Join Date: Jan 2009
Location: topeka
Posts: 116
What is Difference between SPOA & SPUA Springs?

I have a set of 4.5" Rubicon Express Springs that were sold to me as a Spring Under Axle Kit. I have been thinking about going a different direction and bought a set of 78 Ford axles (HP Dana44 (with early 70's Ford Flat top Knuckles) - 9" 31 spline) and am envisioning doing a spoa with those springs. Is there any difference between the springs that would prevent that?

All I have is the springs if that matters.
I have to piecemeal whatever parts I need depending on my direction.'




Proud Jeep owner since 1984

"The" YJ Users Group on the Facebook

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
schaan is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old 04-02-2013, 04:48 PM
Xpress
Registered User
1996 ZJ 
 
Join Date: Dec 2010
Location: The Great Big Box
Posts: 5,929
Garage
SOA is Spring Over Axle. The leaf springs are mounted ontop of the axle:



SUA is Spring Under Axle, or the leaf is mounted on the bottom of the axle. Our Jeeps come SUA from the factory:



SOA is a pretty in depth method of lifting your Jeep. On stock leafs you can get as much as 5.5" of lift, mainly you do it for more flex. Done improperly and it will give you nothing but nightmares. I would stick with an SUA setup.

All about that unibody life.
Xpress is offline  
post #3 of 10 Old 04-02-2013, 05:31 PM
Anticanman
RIP one good jeeper
 
Anticanman's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Ripon
Posts: 20,368
That's a lot of lift. I wouldn't ever go with 10" of lift

Luck Favours The Prepared
Anticanman is offline  
post #4 of 10 Old 04-02-2013, 05:31 PM Thread Starter
schaan
Registered User
1997 TJ Wrangler 
 
Join Date: Jan 2009
Location: topeka
Posts: 116
I got that thanks.. Just wondered if anything different than the spring itself since it came from a SPUA kit.. same springs correct?

I run spoa on my sami and love it, even has revolver shackles but I didnt know if there was something inherently different about the RE SPUA kit leafs that would keep them from working as SPOA's springs.

Perhaps I should have asked if they would be a good candidate for spoa to get 37 or 38's under my yj.

I figured I lose some of that clearance with the larger axles but perhaps with 2" lift shackles I could still clear 37's or 38's & go spua/ I just started working on this.

https://www.facebook.com/photo.php?f...type=3&theater



Proud Jeep owner since 1984

"The" YJ Users Group on the Facebook

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
schaan is offline  
post #5 of 10 Old 04-02-2013, 06:41 PM
DLWRUBI
Registered User
1993 YJ Wrangler 
 
Join Date: Aug 2011
Location: Union City
Posts: 576
Do you really want 10" of lift? It's possible to fit 37's SUA, Just need tube or high line fenders and some trimming. I think stock or the 1.5" RE SOA springs would be more than enough for 37's or 38's as well. I would really think about stretching it either way.
DLWRUBI is offline  
post #6 of 10 Old 04-02-2013, 07:36 PM
fratis
......
 
fratis's Avatar
1991 YJ Wrangler 
 
Join Date: Dec 2003
Location: Hale'iwa
Posts: 5,092
any tire from 35" up will need metal trimming to make work anyways so at the point of going 37/38 might as well cut rather then deal with the headaches of a SOA on 4" springs. in the long run you will be looking for ways to drop the ride height anyways. many of us have been through this. its common to see 40" on 1.5"- 2" springs SOA.

-insert meaningless out-of-place political diatribe-
fratis is offline  
post #7 of 10 Old 04-02-2013, 09:51 PM Thread Starter
schaan
Registered User
1997 TJ Wrangler 
 
Join Date: Jan 2009
Location: topeka
Posts: 116
no i do not want 10" of lift... I knew I was missing something. I can use stock springs possibly rears? and maybe get 6" then it seems. I would rather go spua and see what I can stuff and do some trimming.

Proud Jeep owner since 1984

"The" YJ Users Group on the Facebook

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
schaan is offline  
post #8 of 10 Old 04-02-2013, 10:48 PM
Anticanman
RIP one good jeeper
 
Anticanman's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Ripon
Posts: 20,368
Yep stock springs will be much lower SOA. Just watch the steering and watch out for axle wrap.

Luck Favours The Prepared
Anticanman is offline  
post #9 of 10 Old 04-02-2013, 10:56 PM
Joe Dillard
Electric Chair Operator
 
Joe Dillard's Avatar
1991 YJ Wrangler 
 
Join Date: May 2004
Location: Lexington Park
Posts: 13,291
RE's SOA leafs are a reverse eye design. In other words.....the main leaf eyes have a reverse direction wrap.

The eyes wrap towards the bottom of the leafs vs the tops of the leafs.

I have the RE 1.5" SOA leafs on my POS.
Joe Dillard is offline  
post #10 of 10 Old 04-03-2013, 09:19 AM Thread Starter
schaan
Registered User
1997 TJ Wrangler 
 
Join Date: Jan 2009
Location: topeka
Posts: 116
appreciate the comments

Quote:
Originally Posted by Joe Dillard View Post
RE's SOA leafs are a reverse eye design. In other words.....the main leaf eyes have a reverse direction wrap.

The eyes wrap towards the bottom of the leafs vs the tops of the leafs.

I have the RE 1.5" SOA leafs on my POS.

Thanks Great Help..


Im picking up some flat top knuckles off and early ford D44 to help with steering issues if i go that route. But I am still contemplating and all your comments are helping much. Thanks.

Proud Jeep owner since 1984

"The" YJ Users Group on the Facebook

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









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



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