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Unread 01-23-2009, 08:23 PM   #1
Burlbook48
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How much arch/bend in factory springs?

I need to get new springs, the old factory springs that came with my SOA swap are shot (last weekend's fun run pushed them over the edge). For comparisons sake, what is the arch of new factory springs? Depending on how far mine have sagged, I may want to get 1" or even 2.5" lift springs. BDS and OME are likely candidates.

My heep is SOA, so my spring perch is on the bottom of the spring. For most of you running SUA, I figure a string pulled from shackle eye to shackle eye and measured to the spring perch, plus the thickness of the spring if SUA, would give me a ballpark of the springs arch.

Search didn't really give this info for factory springs, other than a single post stating "flat, or slightly bent". Anybody got a more specific number?

For what it's worth, I have a hardtop and about 220 LBS of rear bumper/spare tire hanging off the back, and the rear springs now have a negative arch of about 1/2". Add a couple passengers and gear, and the springs are just about hitting the bumpstops while parked. Yeah, they're toast.

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Unread 01-23-2009, 08:30 PM   #2
Mean Max
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I can't take measurements right at the moment because I'm at work, but I did an SOA conversion on my wife's '93 YJ and the stock springs were shot. I replaced them with the OE replacement springs from Q-tec for $79 each. They are stock height springs, and here's a pic of how they look.



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Unread 01-23-2009, 08:40 PM   #3
Joe Dillard
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The RE 1.5" SOA leafs measure as follows:

Since these are reverse eye wraped leafs (the eyes wrap from the tops, not from the bottoms) I put a broomstick handle across the tops of each end of the main leaf. Basically making a strait line between the tops of the main eye wrap. Both the fronts & rear leafs measure 2.75" of arch using this method.
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Unread 01-23-2009, 08:50 PM   #4
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man i like your wife's jeep more each time i see it Max! i will swap with you, so you can have his N hers faded red '91 YJs
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Unread 01-23-2009, 08:53 PM   #5
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man i like your wife's jeep more each time i see it Max! i will swap with you, so you can have his N hers faded red '91 YJs
I think I'll keep the YJ. But can I talk you into taking the wife?
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Quote:
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Unread 01-23-2009, 09:00 PM   #6
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I think I'll keep the YJ. But can I talk you into taking the wife?
aww come on man, im sure she ain't too shabby if she drives a YJ. my (soon to be) loves mine, and it's definitely a blessing!
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Originally posted by Crazyquadder:
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Unread 01-23-2009, 09:01 PM   #7
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aww come on man, im sure she ain't too shabby if she drives a YJ. my (soon to be) loves mine, and it's definitely a blessing!
Yeah, I'm kidding. She's a keeper.
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Quote:
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Unread 01-23-2009, 09:36 PM   #8
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Quote:
Originally Posted by Mean Max View Post
I can't take measurements right at the moment because I'm at work, but I did an SOA conversion on my wife's '93 YJ and the stock springs were shot. I replaced them with the OE replacement springs from Q-tec for $79 each. They are stock height springs, and here's a pic of how they look.

Looking at your pic, Max, your 1.5" shackles and 1" BL add a lot to your YJ's overall height. But, your 2.5" springs used SOA give a good bit of lift on their own compared to my wasted set. For example, the top of my 33's are higher than the top of the frame rail where it arches over the axle (using factory height shackles). Your frame rides, uhmm, significantly higher than mine.
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Unread 01-23-2009, 09:39 PM   #9
Mean Max
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Quote:
Originally Posted by Burlbook48 View Post
Looking at your pic, Max, your 1.5" shackles and 1" BL add a lot to your YJ's overall height. But, your 2.5" springs used SOA give a good bit of lift on their own compared to my wasted set. For example, the top of my 33's are higher than the top of the frame rail where it arches over the axle (using factory height shackles). Your frame rides, uhmm, significantly higher than mine.
Those are stock height springs, brand new. It's my wife's YJ, so pay no mind to my Jeep profile specs. The shackles on hers are 1" shackles. And yes, hers has a 1" BL too.
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Originally Posted by UltimatE View Post
Max has a picture of every Jeep part ever made.
Quote:
Originally Posted by Benderff View Post
No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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Unread 01-23-2009, 09:42 PM   #10
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Quote:
Originally Posted by Joe Dillard View Post
The RE 1.5" SOA leafs measure as follows:

Since these are reverse eye wraped leafs (the eyes wrap from the tops, not from the bottoms) I put a broomstick handle across the tops of each end of the main leaf. Basically making a strait line between the tops of the main eye wrap. Both the fronts & rear leafs measure 2.75" of arch using this method.
Thanks Joe, that's the kind of info I'm looking for. Just to clarify, you are measuring the springs while they are bearing the jeep's weight, and measuring to the top of the spring pack, right? I'd have to add about an inch to account for the 4-leaf spring pack's thickness when comparing to my height right now, I'm guessing.
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Unread 01-23-2009, 09:43 PM   #11
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Quote:
Originally Posted by Mean Max View Post
Those are stock height springs, brand new. It's my wife's YJ, so pay no mind to my Jeep profile specs. The shackles on hers are 1" shackles. And yes, hers has a 1" BL too.
Okay, got it. Thanks Max!
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Unread 01-23-2009, 09:44 PM   #12
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Originally Posted by Burlbook48 View Post
Okay, got it. Thanks Max!
Like I was saying, those OE height springs are only $79 each at Q-tec, and I've had no problems with them sagging or anything. It rides much better than my 2.5" SUA lifted '91 YJ does.
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Quote:
Originally Posted by Benderff View Post
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Unread 01-23-2009, 10:55 PM   #13
Joe Dillard
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Quote:
Originally Posted by Burlbook48 View Post
Just to clarify, you are measuring the springs while they are bearing the jeep's weight, and measuring to the top of the spring pack, right?
Yep, exactly.
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Unread 01-24-2009, 07:23 AM   #14
Burlbook48
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Thanks for the clarification, Joe!
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Unread 01-26-2009, 09:27 AM   #15
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Bump for the weekday crew. Hoping to get measurements of factory springs to compare on paper with Joe's RE 1.5" SOA spring measurements.
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