6-cylinder Pickup & 4Runner Transfer Case Setups
Installing a dual transfer case into a V6 equipped truck requires two gear driven transfer cases, as the stock chain drive case is weaker and can not be used. 2.28:1 or 4.70:1 gears can be used in any combination in the two gear driven cases. The most common choice is one set of 2.28:1 gears and one set of 4.70:1 gears, known as an Ultimate™ Crawler. When building cases for vehicles with increased torque, such as a factory V6, or an upgraded V8, two 23-spline inputs should always be used. 21-spline inputs may be substituted in the rear transfer case, however failure of the factory 21-spline input gear is certain. All applications built for a V6 or V8 setup will be built using 23-spline input shafts throughout. Floorboard and drive shaft modifications are required. The factory crossmember remains in its original position.
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Dual Ultimate Crawler Info
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.