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Underdrive Direct Drive

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The Mountain Gear is the heavy hitter, but the company also offers smaller, simpler units such as this 3.23:1 Underdrive/ Direct drive. The lighter-duty box contains a planetary gear setup and uses a manual shifter. It fits between GM TH350, TH400 or TH700-R4 automatic trannies and NP205s, 208s, and 241s. Adapters are also available to mate it to Toyota transfer cases.