A Dual Ultimate Crawler is the combining of both a dual transfer case and a 4.70:1 low range gear set.
Such a set up in a mini truck with a 3.93 first transmission gear and a 5.29:1 ring and pinion ratio, will yield an Ultimate crawl ratio of 223:1 in first gear low range. Through our experience, we consider a crawl ratio of apprx. 220:1 to be an absolutely ideal speed for any trail circumstance.

Wanna-Be Dual Ultimate Crawler

This is when someone combines a dual transfer case setup with a 4.00:1 low range gear set. A typical reduction while using 5.29:1 r'n'p then becomes 190:1. A Lower crawl ratio is desired.

Dual Ultimate Overkill Crawler

This is when one combines a dual case with 2-4.70:1 low range gear sets. A typical low range first gear ratio while using 5.29:1 then becomes 459:1. A ratio this low might only be needed in extremely rare, and possibly never to be found circumstances.