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2007 Jeep Wrangler Rubicon Project - Green Machine

Posted in Features on September 1, 2008
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In mid 2006, a new '07 Jeep Wrangler Unlimited Rubicon joined the 4 WHEEL DRIVE & SPORT UTILITY MAGAZINE fleet. Over the last couple of years, you've seen it modified with a Full-Traction 3-inch suspension, Pure Jeep front and rear bumpers, AEV beadlock wheels with 35-inch BFGoodrich Mud-Terrain T/A KM2s, and 4.88 Superior gears in the stock JK Rubicon Dana 44s. A Warn winch sat in the front bumper. A number of interior modifications were made, but the only one we knew about was the Jeep Trail Guide GPS that worked great. It worked so great, that it, along with the AEV wheels, Warn winch, and other pieces, wasn't on the JK when we took it over. The JK also needed some maintenance, so the Green Machine went into the shop to get repaired and updated.

The Dana 44 frontend still has 4.88 Superior gears and a beefy Dynatrac cover. We plan on changing the gear ratio to 5.38. Since there aren't any 5.38 gears available for these Rubicon 44s (the gears we've reported on and that have been seen at shows are vaporware), we'll be going to aftermarket front and rearends.

First, we removed the 3-inch suspension that was on the Jeep and installed Full-Traction's 4-inch long-arm suspension system. The new suspension is beefy and is built to be used in the backcountry. Really used. Two-inch, 0.250-wall DOM tubing is used for the lower control arms, and there's 1/4-inch plate bracketry throughout. This is a fully bolt-on system. No welding is required to install the suspension. The 4-inch system completely replaces all JK frame bracketry with new components. With 4-inch coils (all that's required to clear 37-inch tires), the Full-Traction long arm's performance is superb.

While the JK already had Pure Jeep body armor, it's made some improvements and upgrades, especially in the swing-away spare-tire carrier. The latching mechanism is now much easier to operate. A simple squeeze of the latch is all it takes to open it. The JK Wrangler's beer-can sheetmetal is tough to protect when rocker guards are bolted to the body below the door openings. Hitting them hard on a rock or tree stump pushes the sheetmetal in and does more damage than the obstacle does. To combat this problem, Pure Jeep redesigned its rocker guards to wrap up around the door openings as well as bolt to the body mounts. We had to have a set of those. We installed a Warn PowerPlant HP winch in the front bumper, so we could not only have a winch, but also a powerful air compressor on the trail. The PowerPlant sits between the framerails in the Pure Jeep bumper, so it doesn't cover much of the Wrangler's grille.

We put the 35x12.50R17LT BFG Mud-Terrain T/A KM2s on American Eagle alloy wheels with OMF beadlocks. Something had happened on the highway before we took delivery of the Jeep, and one of the BFGs had a groove worn down to the cord all the way around the sidewall but still held air. That's one tough sidewall. We made that tire the spare. We plan on running 37s or even 40s in the near future.

PhotosView Slideshow
Our only criticism of the Full-Traction long-arm suspension is the crossmember/front control-arm mount. It's situated perfectly to hit when we drop off a ledge. The suspension's pluses outnumber this one minus though.

We plan on replacing the Jeep Trail Guide GPS. After all, the holes are already there. We also plan on some other interior upgrades we'll keep you updated on in future issues. The stock AM/FM/CD player is quickly going to be replaced with a Jeep head unit that has Sirius satellite radio.

A long-arm suspension is supposed to make a difference off-road. The Full-Traction long arm may be the best suspension we've ever driven with on the road. The JK tracks and corners much better than it did stock and is a real pleasure to drive. It works well off-highway too, although we need to adjust the Off Road Evolution hydraulic bumpstops - something we'll do when we get the larger tires mounted. The only negative point about the Full-Traction long-arm kit is the crossmember/front lower control-arm mount that drops below the frame. It sits exactly at the point where we hit it when dropping the front tires off a ledge. It's lucky that Full-Traction makes all bracketry so strong.

The Green Machine is just about ready to go again. The improvements made to it have made it a better Jeep, both on- and off-road. We're going to enjoy driving it as a daily driver and on the trail. We'll keep you informed of our progress with it as we use it and other changes are made.

PhotosView Slideshow


Full-Traction Suspension
Bakersfield , CA 93313
OMF Performance Products
American Eagle Wheel Corp.
Pure Jeep

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