Abstract: Reciprocating valves in a fluid system of a four-speed automatic transmission having grooves that collect and shed dirt and other contaminants which may inhibit the operation of the valves.

Abstract: A lock-up system for an automatic transmission torque converter including a single movable piston disposed axially between a housing fixed to the torque converter impeller and the torque converter turbine, normally held in a free position by transmission regulated fluid forces and movable in response to a reversal of the fluid forces acting on it to a position where frictional sealing surfaces on the piston and the housing effect a mechanical interconnection of the turbine and impeller.

Abstract: An improved damper is provided for minimizing the transmittal of engine generated torsional vibrations through a transmission employing a hydrokinetic torque converter when the torque converter is operated in a locked up mode wherein the turbine and impeller thereof are mechanically interconnected. The damper includes a drive ring drivingly engageable with the impeller of the torque converter and configured to define an annular channel having a plurality of spring pockets formed therein, a plurality of springs received in the pockets, and a driven ring which may be secured for rotation with the turbine of the torque converter and having a plurality of drive lugs for engaging the springs. The drive ring pockets further include spring seats configured to urge the springs in a direction opposing centrifugal force and the driven ring lugs are formed to facilitate snap fit of the springs into engagement therewith.

Abstract: A semi-automatic transmission incorporating self-energizing cone clutches which make use of radially distributed overlapping helical surfaces for establishing a drive connection in the clutch and for aiding in its energization.