The Legendary Blackbox Underdrive

    The Blackbox Series is NorthWest FabWorks premier line of shiftable, underdrive gearboxes. Typically mounted between the transmission and transfer case, the BlackBox is a gear reduction unit that has the ability to shift from a 2.72:1 low range back to 1:1 for existing operation.

    Released in 2005, our original Blackbox set the benchmark for advanced planetary technology. Since then, the original BlackBox has evolved into a complete product line with dozens of application combinations. The BlackBox offers a gearing solution for everyone; from the weekend warrior, to a top truck challenger.

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