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Old 09-21-2011, 10:19 AM
Thread Starter
Join Date: Mar 2011
Location: Southern California
Posts: 643
RubiCrawler - first hand experience review

I'm going to let Jason review this part since it's on his Jeep.
Advance Adapters Rubi-Crawler Planetary Crawl Box

Jeeping just got wilder. I ordered myself up a RubiCrawler for my 2008 JK-X a few weeks ago and finally had the opportunity to put it to use on Brono Peak in San Diego this last weekend.

I can't believe the difference it makes. It's night and day, converting my Jeep from a race car on the rocks to a John Deere tractor.

I run 37" Toyo MTs with 5.13 gears and ARB lockers in a Super D30/D44 set up. I figure for every 1,000 RPMs with the trans in 1, transfer case in 4WDL, and RubiCrawler in Low, I'd get 1mph.

Getting to the Obstacle:

Stay in Drive with RubiCrawler in Low, or put the RubiCrawler in High and your transfer case in whatever 4WD position you'd normal drive in 4 wheel drive. If you have your transfer case in 4WDL and the RubiCralwer in Low, you'll never get to the obstacle!

On the Obstacle:
Obviously if it's a low speed crawl situation, transfer case in 4WDL and RubiCrawler in Low. You'll find that only minor throttle is needed, the RubiCrawler will do all the work. No more need to give big blips of throttle and have the Jeep lumber or lurch over the rock. I found that many times I actually didn't have to touch the throttle, instead the Jeep seemed to naturally want to climb.

Brake pedal was a thing of the past. Instead, the new lower gearing with the RubiCrawler in Low took over and descent was the safest it's ever been.

This part I'm going to have to work out. With the transfer case in 4WDL and the RubiCrawler in Low, on level ground even with 7 pounds of air in my tires, and with our Rebel RESTRAINT brake upgrade - it took more brake pressure to bring me to a stop. Nothing requiring mashing down or two feet on the pedal, but you do feel a difference.

Did it myself - and for those that don't know me, I'm no mechanic by trade. A lift made a world of difference since there is just as much work to be done under the Jeep as there is inside the Jeep.

Interior: Pull your center console. Yea - no fun, but not impossible. I find it best to only pull my transfer case knob and loosen the bolts for your e-brake. The RubiCrawler instructions have you do more work than necessary. Lift your ebrake handle up as far as it will go with it's bolt loosened and the center console should come out with the rest of it's retaining torx bolts removed. You completely remove your OEM transfer case knob, shifter, and assembly. It's all replaced by very precisely designed Advance Adapter parts that fit perfectly. Building your new shifter assembly does take some time. Go ahead and run the new RubiCralwer cable at this time, no need to wait like the instructions say.

Undercarriage: Remove any skid plates and your OEM cross member. Be sure to support your drivetrain safely and properly. I used a transmission stand with a cut down 2x4 board. Unbolt your OEM transfer case bracket, pull your transfer case. Removing your stub shaft takes some creativity. I tried the slid hammer method, didn't work. Instead, we built the pull tool Advance Adapter suggests. Worked in 10 seconds. That was probably the most time consuming part. Route your shifter cable per the instructions, it fits perfect if you do. Reinstall and you are done.

Advance Adapters Rubi-Crawler Planetary Crawl Box

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