Pickup & 4Runner Kits (1979-1995)

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4-cylinder Pickup & 4Runner Transfer Case Setups

Installing a dual transfer case into a 4-cyl equipped truck requires moving your existing t/case back approximately 6.5 inches. The additional "Crawl Box" is installed between your transmission and t/case. All 4-cyl gear driven t/cases are 21-spline except for the 1986-87 turbo, which is 23-spline. 2.28:1 or 4.70:1 gears can be used in any combination in the two t/cases. The most common choice is one set of 2.28:1 gears and one set of 4.70:1 gears, known as a Dual Ultimate™ Crawler. When building a transfer case for 4-cyl applications, the stock 21-spline input gear can be used. When building turbo, V6 & V8 applications, we highly recommend using a larger 23-spline input in the rear t/case. Otherwise, failure of a factory 21-spline input gear is certain. Floorboard and drive shaft modifications are required. The factory crossmember remains in its original position.

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V6 Applications

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.


We now have NEW 100% REDESIGNED MC08 Billet Adapters Kits IN STOCK!

This is the STRONGEST Dual Case Adapter we've ever made with many new features.

More info coming soon. Please call for details and ordering info at (559) 252-7295!