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Unread 10-30-2011, 11:21 AM   #1
worleysc
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1989 YJ Wrangler 
 
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SOA to SUA???

I purchased an 89 YJ with a spring over conversion and worn out 3.5" Superlift springs that had leafs removed (2 from the front and 1 from the rear), great off road, not so great on the road. Decided to make it safer since my son (his first vehicle) will drive it most of the time. So I purchased the only springs my local 4wp center had in stock for a YJ. 4" procomp. Pretty close to what was on it, so why not. Bolted right up, no problems, except now it was a little too high. Should have planned better, I know. It's all good, spring under will give a solid 4" lift and I can still run the new 35 inch tires that came on the jeep. The problem I have now is that the axles are not centered in the wheel well, front or rear. WTH? The pins are located in the center of the spring pack and we measured that before we started tearing it down. I still need to relocate the spring perches for pinion angle, and yes the new cv shaft is probably too long now, and Im not happy about that, but I should have planned better, I know. Any advice or explanation would be appreciated. Thanks.

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Unread 10-30-2011, 11:29 AM   #2
Ripper3494
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nothin really you got it covered, relocate perches, set pinion angle, modify driveshaft, only like 80 bucks. another option that most guys do is keep the soa with the stock springs thatll give you a nicer ride and 5.5in of lift. using lift springs with soa is an accident waiting to happen most of the time
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Unread 10-31-2011, 06:33 PM   #3
worleysc
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So today I was piddlin around in the shop, cleaning and thinking. Scary stuff. As I prepare to yank out the rear axle housing as to weld up new perches, I hit a road block. An old 9inch (3:00-1 ratio) from one of my Galaxie projects is right in the way. Tape measure in hand, I think what the heck. Guess what, it measures out to 60.75 exactly, 5x4.5 bolt pattern, yoke to CL of axle is the same, cool. Tear down begins.
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Unread 11-01-2011, 12:07 PM   #4
1tuffyj
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That's not gonna be the same shaft spline count as trucks. Ill guess 28 instead of 31. Just fyi
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Unread 11-01-2011, 07:32 PM   #5
burnout189
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good stuff on the 9"

SOA on 4" springs is going to give you a BIG jeep. That thing is going to be dangerous on the street unless you spend some bucko's on the steering and driveshafts.

I would suggest going back to sua on the 4" springs if you dont want to mess with the steering, etc.

EDIT: I actually read your post this time, and realized that you already decided to go SUA. Disregard this statement ^
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Unread 11-01-2011, 07:57 PM   #6
Apollo12227
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Quote:
Originally Posted by worleysc
As I prepare to yank out the rear axle housing as to weld up new perches, I hit a road block. An old 9inch (3:00-1 ratio) from one of my Galaxie projects is right in the way. Tape measure in hand, I think what the heck. Guess what, it measures out to 60.75 exactly, 5x4.5 bolt pattern, yoke to CL of axle is the same, cool. Tear down begins.
If you are going to install a ford 9" in your jeep you will need to upgrade to 31 spline shafts. The 28 spline shafts WILL FAIL with larger tires and moderate abuse. I have a ford 9" in my jeep, I'm 100% happy with it. I have 4.56 gears and a Detroit locker. You need to invest in new shafts if your going to go for it.
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Unread 11-01-2011, 08:08 PM   #7
youngjeepr
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I would order a set of stock replacement springs and stay SOA
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Unread 11-02-2011, 07:22 AM   #8
worleysc
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Thanks for all the replies. For now I'm staying with the 4" sua, I like the way it rides on asphalt.
As far as the 9" goes, 28 spline is correct. But it is a direct bolt in minus the perches and shock mounts, which I have to do fab work on either axle.
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Unread 11-02-2011, 05:10 PM   #9
HARLEYX2
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Its not a direct bolt in if it doesnt have the same gear ratio as the front. 3.07 gears. 35s and those gears and it will be a turd. Also unless you have a body lift 35s wont fit with a SUA 4 inch lift.
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Unread 11-02-2011, 05:31 PM   #10
plmqazed
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ripper basically just said it all
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Unread 11-02-2011, 06:22 PM   #11
giggityjeeper
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Quote:
Originally Posted by Ripper3494 View Post
nothin really you got it covered, relocate perches, set pinion angle, modify driveshaft, only like 80 bucks. another option that most guys do is keep the soa with the stock springs thatll give you a nicer ride and 5.5in of lift. using lift springs with soa is an accident waiting to happen most of the time
meh I run SOA and 3.5 springs and 5/8 shackles, no sways and no trac bars, its quite manageble on and off road actually... drive it accordingly... its not a race car thats for sure
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Unread 11-03-2011, 02:30 AM   #12
tankinyj
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Quote:
Originally Posted by 1tuffyj View Post
That's not gonna be the same shaft spline count as trucks. Ill guess 28 instead of 31. Just fyi
yes the spline count on a 9" out of a car is 28 spline. UNLESS it is a 9" out of a big block or hi-po mustang/torino (boss 302, boss429, boss351, 428 SCJ, etc then you will have the 31 spline axles with the larger bearings
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Unread 11-04-2011, 09:53 PM   #13
worleysc
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Well, gears are inevitable anyways. I was merely referring to the dimensions. 35s will fit, that part is done already, more than enough clearance. As far as 9" big or small bearing, 31-28, doesn't matter, still better than a stock Dana. Thanks for all that helped, not so much to those that just try to squash.
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Unread 11-04-2011, 10:22 PM   #14
HARLEYX2
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So you are running 35 inch tires SUA with a 4 inch spring and no body lift or cut fenders?
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Unread 11-05-2011, 03:09 AM   #15
durrster1128
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thats what i was running on my jeep before the rebuild. they actually fit nicely.
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