The MT644 and MT654CR Two New Automatic Transmissions For High-Torque, Low-Speed Diesels

Two new automatic transmissions, the MT644 and the MT654CR, have been developed to fill a market need for use with a class of heavy-duty, low-speed diesel engines. In the concepting, planning, designing and developing of these units, both domestic and overseas markets were analyzed, and current vehicle factors and trends were considered.

The resulting products incorporate new or improved features such as increased capacity torque converter for high torque engines, increased flow oil pump for better cooling, and modulated converter lockup for greater fuel economy. Also goals of maximum commonality of parts with other current transmissions and of minimum inpact on OEM installation requirements were achieved.