Advance Adapters RubiCrawler for Jeep TJ and JK Wrangler

The Advance Adapters RubiCrawler reduction gear system is unique. A planetary gear set enables extreme gear reduction for off-road use. The unit fits without any driveline modifications and works with the 42RLE automatic transmissions found in many late Jeep TJ Wranglers and the JK Wrangler models.

With the 42RLE's 1st gear ratio of 2.84:1, a Rubicon model’s 4:1 low range, the RubiCrawler’s 2.72:1 ratio and a final axle ratio of 4.10:1, the total reduction available is 127:1! Add to this the torque converter multiplication, and the torque available in the lowest gear slots is astounding. Steve Roberts walks us through an overview of the RubiCrawler at Advance Adapters, Paso Robles, California.