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A torque converter lock-up clutch was introduced by Chrysler Corporation in a majority of its passenger cars in the 1978 model year. The lock-up clutch improves fuel economy by eliminating torque converter slip in direct gear above a predetermined speed. The clutch and its controls were designed to fit within the confines of the existing transmission. The development of the clutch was primarily concerned with achieving adequate endurance life, good shift quality and isolation of torsional vibrations.

This is a report of the status of the development of a Band Friction Test Machine that will measure friction of automatic transmission band-drum combinations used in current production passenger cars. The fixture’s operating requirements are described, along with a detailed listing of its features. The test procedure and test data from a prototype machine are discussed. It is hoped that this machine will enable greater correlation of data in this area.