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Project YJ - Rubicon Express SOA
Preparation
Installation
Test Drive
Conclusions

 
 

 
 
Project YJ Articles
Introduction
Detailed History
Rubicon Express
Spring-Over
Bumper/Tire Rack
Rhino Liner
Scout Axle Swap
Detroit Lockers
vs. Lockrights
TeraLow Dana 300 4:1 Kit
Go 2 Twister Dana 300 Re-Indexer
Bestop Supertop
Transmission Overhaul
TJ Flares Install
Rocker Armour
Bestop TrailMax Aqua Sport Seats
Kilby Gas Tank Skid Plate
Teraflex Revolvers
Kilby High Volume Automatic Transmission Pan
Hi-Steer Conversion

 
 

Conclusions

Although I still have to deal with the driveline vibration problem, I must admit that RE's kit satisfied the majority of my pre-purchase concerns. Most importantly, I was able to install it over the weekend and drive it to work the following Monday.

Pros

Benefits of my new suspension over my old 2.5" spring lift include:
  • Softer ride.
  • Vastly improved axle articulation.
  • Improved fender clearance.
  • Easier to remove/install sway bar link.
  • Use of easily and cheaply replacable spring packs.
  • Improved rear shackle clearance.

Cons

  • The on-street handling is a bit worse than before.
  • The steep driveshaft angle makes it very sensitive to incorrect angles. I'm not sure if parallel angles can be maintained over the life of a spring pack as it starts to sag.
  • Minor bumpsteer over hard bumps or hard braking.

Is This Kit Right for You?

Should you convert your Jeep to a spring-over set-up? It depends, as always, on the types of trails you frequent and your tolerance for reduced highway performance. I've been fourwheeling rather seriously for the past three years and have encountered very few situations where my combination of 31x10.5 mud tures, 2.5" suspension lift and rear locker were insufficient for the trail. For the majority of Jeepers, this kind of modification is not needed. BUT...if you want to get into the extreme trails then the RE spring-over is a good route for obtaining better ground clearance and articulation for a great price.

I must caution you, however, that this kit and its instructions are only the starting point for a spring-over conversion. Fine-tuning will be required. Component fitment problems might be magnified and need to be rectified. In my case, the steeper angle on the front driveshaft is causing it to rub against my exhaust pipe.

My Recommendations to Future RE Installers

  1. DO NOT accept the installation instructions as gospel. This is a very critical operation and you are obliged to exercise extreme care in all the measurements and angles. Although it may seem cumbersome, I strongly recommend tacking the on the rear spring perches and then measuring the transfer case and pinion angles to ensure that they're parallel. Only after you've successfully done this test should you finish the welding.
  2. See above. I just wanted to re-iterate that very important point.
  3. Contrary to what you might have seen in RE's how-to video, removing the pitman arm and drag link are very difficult. Spraying them with penetrating oil helps. A pitman arm puller is absolutely mandatory. You can also use the puller to pop the drag link off the pitman arm (I thoroughly mangled the grease cup on my drag link by using a pickle fork before realizing that the puller was better suited for the task).
  4. Buy the installation video, it's worth watching.
  5. I have an MIT tail cone eliminator kit on my transfer case. That makes my driveshaft approximately 4 inches longer than stock. Even with that advantage, it's still running at about 20 degrees which seems kind of steep to me. I shudder to think what angle a stock driveshaft would be running at. I've thought about this point quite a bit before committing it to paper (figuratively speaking, of course): Include a CV joint driveshaft and tail cone eliminator kit as part of your upgrade. From a durability stand point, these are must-have items. You may be able to get by for a few months or a year but the broken parts will start catching up to you.
    RE is already offering a CV joint driveshaft for their kit and will also sell tail cone conversion kits. Buy them.
    I will be researching the need for a CV joint in more detail so I reserve the right to change this particular point.
  6. This is a long job. Make sure you plan at least two full days for semi-relaxed pace and try to do it when parts stores are open.
  7. RE says that you need to attach the front track bar if you install their kit due to bump steer problems. I have detected bump steer but it's not much worse than with my 2.5" lift kit and no track bar. I've been commuting in my Jeep with the spring-over and no track bars for the past two weeks and don't consider bump steer to be a problem. Do be sure to keep the sway bar attached, however. With the spring-over and no sway bar, it is now a very terrifying experience to drive on a curvy road.
  8. After you complete the spring-over, your steering wheel will be cock-eyed when the wheels are straight. To remedy this, you need to adjust the drag link. Just loosen the clamps on either end of the drag link, spray the threads liberally with penetrating oil, then use a monkey wrench to turn the tube in the proper direction (watch the steering wheel to figure out which way to turn). Make sure your ignition steering lock isn't on.

Well, that's all that I have to say about that! Please send me email if you have any questions.

...lars


 
 
 

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