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Unread 08-08-2011, 07:28 AM   #1
Skooter
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SOA and traction bar question..

I see everyone who does SOA say you must have a traction bar system. I am curious why they have to have one after SOA? There are a few million vehicles out there with leaf springs over the axle with no trac system and they do just fine. What makes a YJ leaf and axle so different?

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Unread 08-08-2011, 07:56 AM   #2
pasinbuy
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The new pinion angle after you do a SOA. Makes axle wrap too easy.
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Unread 08-08-2011, 10:00 AM   #3
E_ROCK
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Quote:
Originally Posted by Skooter View Post
I see everyone who does SOA say you must have a traction bar system. I am curious why they have to have one after SOA? There are a few million vehicles out there with leaf springs over the axle with no trac system and they do just fine. What makes a YJ leaf and axle so different?
The jeep draintrain length is too short. You quickly exceed the max u-joint angle and pop them. We also 4wheel and a bunch of trucks just see the street. Take some cues from Formula Toy builds. F-toy have to be leaf sprung to compete. They also put in anti-wrap bars.

From personal experence...Your anti-wrap bar design can also cause rear hop. Make sure you make it as long in length as possible. I had a shorter one and had bad rear hop climbing rocks. I stretched my rear wheel base 4 inches and lengthen my anti-wrap bar like ~6"-8" inches. No more rear hop and the tires hook up better.
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Unread 08-08-2011, 12:08 PM   #4
leadsled01
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YJ springs are soft , when you go SOA its too much strain and you will get alot of wrap which will eat rear drive shafts/ujoints. I went SUA rear and SOA front and love this set up.
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Unread 08-13-2011, 12:55 PM   #5
Skooter
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Quote:
Originally Posted by E_ROCK View Post
The jeep draintrain length is too short. You quickly exceed the max u-joint angle and pop them.
Now this I'll buy, I just cant believe YJ springs are all that soft. My YJ has more leafs than my Dakota and the Dak hauls 2000lbs around all day without a trac aid.

Quote:
Originally Posted by E_ROCK View Post
From personal experence...Your anti-wrap bar design can also cause rear hop. Make sure you make it as long in length as possible. I had a shorter one and had bad rear hop climbing rocks. I stretched my rear wheel base 4 inches and lengthen my anti-wrap bar like ~6"-8" inches. No more rear hop and the tires hook up better.
What engine/power do you have? I guess Im safe in assuming a 300hp 340 is going to compound my problem in that repect?

Btw.. thanks for the input from everyone.
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Unread 08-13-2011, 02:07 PM   #6
yj87ben
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I have the SOA suspension. Started with Rancho 1.5" lift springs without a traction device. See picture. Destroyed the springs. Replaced with factory five leaf, and did the same thing. Built and installed a traction bar, no more problems. And you know how sometimes YJs squat in the rear under acceleration, gone.
misc-pictures-1582-.jpg   misc-pictures-1586-.jpg   play-time-004.jpg  
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Unread 08-13-2011, 03:34 PM   #7
timatoe
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Quote:
Originally Posted by Skooter View Post
Now this I'll buy, I just cant believe YJ springs are all that soft. My YJ has more leafs than my Dakota and the Dak hauls 2000lbs around all day without a trac aid.
Has nothing to do with the "softness" of the springs. It's pretty well proven that it's needed, seems like a silly waste to do all the work of going SOA and not complete the job.
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Unread 08-13-2011, 06:50 PM   #8
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Quote:
Originally Posted by Skooter

What engine/power do you have? I guess Im safe in assuming a 300hp 340 is going to compound my problem in that repect?

Btw.. thanks for the input from everyone.
I have the stock 4.0. HP compounds the problem. Here is the hopping that I was getting,

http://erock.rockfrogs.org/Video/Indy_exit.wmv

It is gone now! I stretched the wheel base, added wheel base length, and run ford ranger springs.
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Unread 08-13-2011, 08:55 PM   #9
Skooter
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Quote:
Originally Posted by yj87ben View Post
I have the SOA suspension. Started with Rancho 1.5" lift springs without a traction device. See picture. Destroyed the springs. Replaced with factory five leaf, and did the same thing. Built and installed a traction bar, no more problems. And you know how sometimes YJs squat in the rear under acceleration, gone.
What in the world are you using for a power plant?? I havent seen that done to leafs since my 440 Cuda on N2O!!

I guess I just cant wrap my head around the geometry of the YJ suspension and yes.. I will be building a traction device to keep that from happening and thanks for the length and spring brand advice.
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Unread 08-13-2011, 08:59 PM   #10
Skooter
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Quote:
Originally Posted by E_ROCK View Post
I have the stock 4.0. HP compounds the problem. Here is the hopping that I was getting,

It is gone now! I stretched the wheel base, added wheel base length, and run ford ranger springs.
Thanks again for your advice E Rock.
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Unread 08-13-2011, 11:42 PM   #11
TSEJEEPERS
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I think it all depends on the vehicle.
I had severe axle wrap. 4.0L SOA with Rubicon Express SOA springs.
I could not keep a rear driveshaft under it so save my life.
Some freinds I wheel with have a YJ SOA 2 inch lift springs 4 cylinder,
another has a CJ SOA XJ springs in front reverse shackle, no name springs on rear, Ford 304.
The last has stock CJ springs SOA with a AMC fuel injected 360.
None of them have have axle wrap.
Not sure why?
I will say a traction bar is alot cheaper to build and install than replacing driveshafts.
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Unread 08-14-2011, 05:28 PM   #12
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Quote:
Originally Posted by yj87ben View Post
I have the SOA suspension. Started with Rancho 1.5" lift springs without a traction device. See picture. Destroyed the springs.
Well one of your major issues with that leaf warped is not necessarily from torgue wrap, but that of you running a too large/long of a perch. That perch is way too long and flattens out the spring too much at center mount contact. You should be using a smaller perch IMHO.
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Unread 08-20-2011, 02:20 PM   #13
yj87ben
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Quote:
Originally Posted by Skooter View Post
What in the world are you using for a power plant?? I havent seen that done to leafs since my 440 Cuda on N2O!!

I guess I just cant wrap my head around the geometry of the YJ suspension and yes.. I will be building a traction device to keep that from happening and thanks for the length and spring brand advice.
2.5L 4cyl., AX5, NP231 to D30/35 4.56s, w/ARBs.
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Unread 08-20-2011, 02:32 PM   #14
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2.5L 4cyl., AX5, NP231 to D30/35 4.56s, w/ARBs.
Hey, you can find my info now. Just click on my jeeps in my sig (I figured I'd help you out).
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Unread 08-24-2011, 09:29 PM   #15
yj87ben
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Originally Posted by SkyJumper View Post
Well one of your major issues with that leaf warped is not necessarily from torgue wrap, but that of you running a too large/long of a perch. That perch is way too long and flattens out the spring too much at center mount contact. You should be using a smaller perch IMHO.
You could be right. The perches came from Rocky Road Outfitters in their piece of crap Bolt-on SOA kit. Needless to say the perches(rear)aren't bolted-on. The 8.8 will be in this month, and I'm going with much shorter perches from Cut throat 4X4.
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