The RubiCrawler for 2003-2011 Jeep TJ/LJ with 42RLE automatic transmission doubles your gear ratios by adding a 2.72:1 planetary reduction between your transmission and stock NP231 or NP241OR transfer case. Includes TJ-specific twin stick cable shifter for factory console mounting, RubiCrawler 2.72:1 reduction unit, and all hardware. Zero length added to drivetrain.
What's Included: RubiCrawler 2.72:1 planetary reduction unit that replaces your 42RLE tailhousing, TJ-specific twin stick cable shifter designed for factory console, shift cables with mounting brackets, installation gaskets and hardware, and detailed instructions. Everything needed for complete installation.
Gear Ratio Combinations: With NP231 Transfer Case - High 1:1 normal driving, Low 2.72:1 moderate trails, Ultra-Low 7.40:1 extreme rock crawling (2.72 x 2.72).
With NP241OR Rubicon Transfer Case - High 1:1 normal, RubiCrawler Low 2.72:1, Transfer Case Low 4.0:1, Ultra-Low 10.88:1 competition terrain (2.72 x 4.0).
Four gear ratio options instead of two.
2003-2011 TJ/LJ Application: Fits all 2003-2011 Jeep Wrangler TJ and Unlimited LJ models equipped with 42RLE automatic transmission. The 42RLE is the 4-speed automatic that came with these Jeeps. Works with both non-Rubicon NP231 and Rubicon NP241OR transfer cases.
Twin Stick Shifter for TJ: Replaces factory hard linkage with cable-operated twin stick shifter. Designed specifically for TJ console - mounts in stock location for clean installation. One stick controls the RubiCrawler, the other controls your transfer case. Independent control of both units.
How It Works: Replaces your 42RLE tailhousing with a 6-gear planetary reduction unit. Same length as factory tailhousing - nothing moves, transfer case stays in place, driveshafts remain stock length. When engaged, adds 2.72:1 reduction that multiplies with your transfer case ratio. Shift-on-the-fly capable.
Benefits: Ultra-slow crawling (0.25 mph possible), reduced automatic transmission heat, engine stays in powerband at crawl speeds, precise throttle control for traction, competition-level capability with 10.88:1 ratio on Rubicons. Compatible with lifted TJs, larger tires, upgraded axles.
Installation: Bolt-in design, replaces transmission tailhousing only. No permanent modifications. Transfer case bolts to RubiCrawler output shaft in stock location. Twin stick shifter mounts in factory console. Professional installation recommended, typically 6-8 hours.
Specifications: 2.72:1 reduction ratio, 6-gear planetary design, shares ATF+4 fluid with 42RLE transmission, zero length added to drivetrain, approximately 35 pounds, cable shifter operation, Made in USA.