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In 2006, Caterpillar started producing CX31 and CX28 automatic transmissions, which can be used in recreational vehicle applications. The CX28 has six forward speeds with horsepower up to 400 and torque up to 1,250 pound-foot. It matches up with the Cat C7 and C9 diesel engines. The CX31 has six forward speeds and one reverse speed with horsepower up to 600 and torque up to 1,850 pound-foot, with a weight comparable to currently available alternatives equipped with power take-offs (PTO). The CX31 matches up with the C13 and C15 diesel engines.