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Unread 04-02-2013, 04:46 PM   #1
schaan
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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.'



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Unread 04-02-2013, 04:48 PM   #2
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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.
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Unread 04-02-2013, 05:31 PM   #3
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That's a lot of lift. I wouldn't ever go with 10" of lift
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Unread 04-02-2013, 05:31 PM   #4
schaan
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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.

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Unread 04-02-2013, 06:41 PM   #5
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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.
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Unread 04-02-2013, 07:36 PM   #6
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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.
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Unread 04-02-2013, 09:51 PM   #7
schaan
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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.
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Unread 04-02-2013, 10:48 PM   #8
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Yep stock springs will be much lower SOA. Just watch the steering and watch out for axle wrap.
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Unread 04-02-2013, 10:56 PM   #9
Joe Dillard
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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.
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Unread 04-03-2013, 09:19 AM   #10
schaan
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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.
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