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Advance Adapters Part 42R023 - Low Range Rubi Crawler
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Low Range Rubi Crawler

By Advance Adapters

Part Number: ADV42R023
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Overview

Jeep TJ owners with the 42RLE, 4 speed overdrive automatic listen up! Do you dream of having multiple 4wd low ranges just like the latest and greatest after market transfer cases without having to sacrifice your bank account or prep your Jeep for some major retro-fit surgery? Advance Adapters is proud to release the Rubi-Crawler. This new reduction unit replaces the stock 42RLE tailhousing with a 6 pinion planetary assembly featuring a 2.72:1 low range. This is a true bolt-in doubler that couples to the stock Jeep transfer case or an existing Atlas 2 speed.

The Jeep 42RLE transmission has a stock tailhousing that is approximately 7” long. The rear output shaft in this tailhousing is actually a spud shaft, that pulls out of the rear of the main transmission case and leaves the stock output shaft in place. The Rubi-Crawler has a custom input gear that couples to this transmission main shaft with no modifications to the transmission. This new input gear drives 6 planetary gears that gives the Rubi-Crawler the 2.72:1 reduction. The Rubi-Crawler’s housing is exactly the same length as the stock tailhousing and includes a new 23 spline output shaft that couples the rear of the Rubi-Crawler to the stock transfer case, leaving everything in the stock location.

The Rubi-Crawler’s shifting mechanism utilizes push pull cable technology for a smooth and easy shift. The universal cable shifter is included with the purchase of your Rubi-Crawler. We are still designing a custom cable shifter for the TJ and JK consoles.

Ratio possibilities with a :
[*]Stock New Process 231/241 are a 2.72:1 and a 7.40:1[*]Stock NP Rocktrac are a 2.72:1, 4.0:1 and a 10.44:1[*]Atlas 2.0 are 2.0:1, 2.72:1 and a 5.44:1[*]Atlas 3.0 are 2.72:1, 3.0:1 and a 8.16:1[*]Atlas 3.8 are 2.72:1, 3.8:1 and a 10.44:1[*]Atlas 4.3 are 2.72:1, 4.3:1 and a 11.70:1[*]Atlas 5.0 are 2.72:1, 5.0:1 and a 13.60:1

Technical Details

  • Fits 1997 to 2006 TJ Wrangler and Unlimited
  • With 42RLE automatic transmission
  • NP231 transfer case
  • Has 6 pinion planetary assembly featuring a 2.72:1 reduction
  • True bolt in doubler to stock Jeep transfer case or an existing Atlas 2 speed

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