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Dual Case Kit (MC08)

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Have you ever heard of the term “Rock Crawling”? Chances are you have. But what you may not know is that this now household term was created by Marlin Czajkowski of Marlin Crawler. Invented in 1994 (the “MC01”), Marlin has invested more time and energy than any one else in the world on Toyota dual case setups. With over years experience, we build the strongest and most reliable Toyota dual case adapters in the World.

The MC08 is machined from a solid piece of USA Billet Aluminum for the Ultimate in adapter strength!

Marlin Crawler Compeition Series

The backbone of Marlin’s revolutionary design is our Double Roller 32-ball mainshaft bearing which prevents coupler failure and keeps you moving on the trail.

The Billet MC08 XD includes all of the great “Xtreme Duty” Features as our cast MC07 XD kit.

Brief install notes:
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 the 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, 4.00:1, 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 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.

Kits Include: Double bearing adapter housing, new oversized billet main shaft, double roller bearing pressed and installed, Cage roller bearing pressed, installed, and greased, Marlin Crawler Turtle Knob key way for shift fork, Toyota transmission output seal, attaching hardware.


Check out this video demonstrating the power of the MC08!

Weight 18 lbs
Dimensions 10 × 10 × 8 in
Input Spline Count

21-spline, 23-spline

Make Model Year Notes
Toyota 4Runner 1984 - 1989
Toyota 4Runner 1990 - 1995
Toyota Hilux 1979 - 1983
Toyota Hilux 1984 - 1988
Toyota Hilux 1989 - 1995

Proposition 65 Warning for California Consumers

WARNING: Products we sell can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

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