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Old 03-09-2012, 10:45 PM   #1
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Spring over conversion yj

What all is involved in the spring over conversion? Is it an easy task? What about cost-wise? My yj rides pretty rough when hitting bumps etc. I replaced the shocks and it 'helped' but still pretty rough. My '12 jku rides like a dream (ya its 20 years newer) but someone told me there isn't much I could do to improve the ride on leaf springs. Is that true? Will spring over suspension make it ride a lot better?

This is a kit I found but not sure what else is needed aside from springs etc. Can someone who has done this provide feedback? Btw I am not lifted right now and have 31 bfg all-terrains on it (no fenders). Am I biting off more than I can chew or would this be a somewhat easy task to accomplish by myself? Thanks

5.5 Spring-Over Conversion Kit RUB-RE5015

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Old 03-09-2012, 10:57 PM   #2
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It all depends on how mechanical you are. There are a lot of write-ups on this and other sites.

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Old 03-09-2012, 11:10 PM   #3
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I'll admit I did not search too hard for it. I can usually figure things out pretty quick but I am used to coilover suspension (wishbone) but I haven't worked much with leaf springs but I think I understand the general theory.
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Old 03-09-2012, 11:51 PM   #4
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Few things you should know before diving into it:

-Don't waste any of your time and effort on the D35.
-It's expensive.
-It takes time and good skills with a welder.

You will have to convert your axles to spring over, SYE on the t-case, t-case drop, high steer conversion, etc. etc. etc.

Most people who do SOA park their Jeep and rely on another DD because it is very time consuming to do everything properly.
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Old 03-10-2012, 07:40 AM   #5
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actully..........a SOA is easy IF U HAVE a welding machine or access to one. new spring perches, and a new steering arm is all i needed. decided to use new shock ounts instead on reusing old ones. DID not have to extent brake lines at all. I also swapped in my ford 8.8 at the same time. Did not want to drop T-case do to shifter hitting, so i am raising my motor a inch instead. This will help with driveline angle. A SYE is not mandatory.........heard tell can go SOA +2 without a SYE. Im at SOA +1.......will be removing the +1 when i convert to a SRS. Will finish getting my driveline angles etc correct then.
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Old 03-10-2012, 07:51 AM   #6
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I just did the SOA and got about 5.5 inches. The only problems so far is the vibrations from the drive shaft. Is there any other way to stop that other than putting in the SYE?
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Old 03-10-2012, 08:34 AM   #7
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what are your driveline angles at ? the lower angle should be 1 to 2 degrees more due to when your on the gas, the axle will pivot up a tad........may need to do a tcase drop or engine llift.
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Old 03-10-2012, 09:27 AM   #8
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Did the tcase drop. Had to put some wedges in the rear end to make the angle right.
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Old 03-10-2012, 09:36 AM   #9
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No SYE or highsteer is needed....you really dont need to drop the case if you set the pinion right before you weld the rear perches
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Old 03-10-2012, 09:39 AM   #10
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So what recommendations since its already welded? Its kind of a hit or miss process.
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Old 03-10-2012, 09:43 AM   #11
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Well, your not gonna like it but it needs to be cut loose and fixed right. There's not an exact degree of which it needs to be set at since every rig is different. What I do is raise the pinion with a jack and put it about 2 degrees down from straight to the case and weld it up.
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Old 03-10-2012, 09:59 AM   #12
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I don't mind doing that if its gonna fix it. Thanks.
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Old 03-10-2012, 10:01 AM   #13
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It will, I haven't had one yet that vibrated
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Old 03-10-2012, 01:52 PM   #14
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So pretty much its a big project thats what I wanted to know. I don't even have a welder. Meh oh well
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Old 03-10-2012, 08:31 PM   #15
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On stock springs you have to worry about the ol axle wrap. That's why I'm waiting to soa my jeep gonna be some money for everything and jeep will be down. Anti wrap bar is a very good idea. Axle wrap is the devil haha.
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Old 03-11-2012, 10:37 AM   #16
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Not saying it wont happen but im pretty positive I have it welded very good.

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