To our valued customers,

While this time of year typically involves the chance to shop our products on sale, we had to make the tough decision to postpone any promotional pricing in light of supply chain issues, rising costs and several other factors affecting our business as well as our vendors. We know that our Black Friday/ Cyber Monday sales are very popular and we hope to bring them back once these situations stabilize. We appreciate our customers and want to thank you for continuing to choose Advance Adapters.

With sincere thanks- The Advance Adapters Team



Rubi-Crawler : Rubi-Crawler Auxillary Crawl Box For 42RLE Transmission (#Rubi-Crawler)

Starting at: $2,011.22

  • This unit fits all Jeeps 2003 to 2011 with the 42RLE automatic overdrive RubiCrawler assy

This reduction unit replaces the stock 42RLE tailhousing with a 6 gear planetary reduction box featuring a 2.72 low range. This is a true, bolt-in doubler that couples to the stock Jeep transfer case or an existing Atlas transfer case.

Features: The RubiCrawler increases your available gear ratios. This allows you to choose the appropriate gear, depending on the terrain in which you're wheeling. Proper gear choice will allow you more control of the vehicle. Ultimately, this contributes to a fun, and safe, offroading experience, even in extreme environments.


*TJ Wrangler - Stock Transfer Case

*JK Wrangler - With Heavy Duty Transfer Case Shift Kit

  • This is an option for customers installing the Rubicrawler in the Jeep JK Wrangler. The Shifter in this kit upgrades your transfer case shift cable along with the cable connections to heavy duty heim joint style connection. Rubi JK


  • 42R800: Rubicrawler Electronic Interface
  • 42R650: Anodized Billet Aluminum Knobs

*TJ Wrangler or JK Wrangler - Non Stock Transfer Case

  • This is the option for customers installing the Rubicrawler in conjunction with an aftermarket transfer case like the Atlas Transfer Case by Advance Adapters.

Video Links

1. Rubicrawler Information

2. Rubicrawler - Ratio Possibilities

3. Rubicrawler - Installation

Top Reviews


by Woody's 4x4, from Vancouver, WA

Rubi crawler Simple extra Gear Options

Thanks for the Great Product and the new twin cable shifters for the TJ work awesome. Install went really smooth with no issues. Customer had np231 and went to a np241or from a rubicon but did not want to lose his regular low range. This made keeping the original and getting the extra final a bonus. Highly recommend to anyone.

1317 of 2659 people found the following review helpful.

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