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Offroad Design Magnum Box Transfercase

Posted in How To: Transmission Drivetrain on October 1, 2012
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If you’re building a fullsize truck for extreme off-road use like rockcrawling, then you’ve probably heard of the Doubler. A 203/205 Doubler involves mounting a NP203 reduction box in front of an NP205 transfer case for a compound low range and better off-road torque management. Offroad Design (ORD) has long been the go-to place for rebuilt 203 boxes, 205 transfer cases, and the appropriate adapters to install them in fullsize 4x4s. But what if there could be something better?

To make a stronger gear reduction box, ORD went back to the drawing board and developed the new Magnum Box. This planetary reduction box is smaller, lighter, and yet equal in strength if not stronger than the old Doubler. It has more options for gearing, adaptation, and wheelbase fitment. The Magnum Box is a step above and beyond the Doubler and fixes the minor weak links that the Doubler has. ORD has even gone so far as to recommend this box for more than just fullsize GM, Ford, and Dodge trucks. If you’re building a big-power, heavyweight Jeep Wrangler, for example, this may be just what you need for optimal gear reduction. We stopped by ORD to see a prototype unit assembled and got exclusive first shots of the guts of the Magnum.

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