Abstract: In an internal combustion engine, a shaft driving apparatus and timing assembly in the form of a camshaft sprocket having first and second ends extending perpendicular to the axis of rotation. The first end for defining an annular timing surface positioned adjacent an angular position sensor and including a first arcuate surface region extending outwardly in the axial direction from the sprocket's first end and a second surface arcuate region recessed in the axial direction with respect to the first arcuate surface region. As the camshaft rotates, the closeness of the position sensor to the first arcuate surface region and the relative greater distance of the sensor to the second arcuate surface region produces different effects so that the sensor can detect the camshaft's angular position.

Abstract: A countershaft type power transmission has a plurality of hydraulically actuated synchronizers which are selectively operable to establish the gear ratios in the transmission. Each synchronizer is effective to control one or more ratios and is positionable between neutral positions. A hydraulic control system is provided to control the movement of the synchronizers and to hydraulically force each synchronizer to neutral when it is not called upon for ratio establishment.

Abstract: A hydraulic transmission control uses a plurality of solenoid valves to control the engagement of friction devices during the shifting of a transmission between gear ratios. A clutch priority valve is provided to prevent the continuous simultaneous engagement of friction devices which will establish more than one ratio. Also provided is a manually controlled valve which permits the operator to determine the range in which the transmission will operate.If the clutch priority valve has been actuated, the transmission ratio can be controlled between a low ratio, for example, second gear, and a high ratio, for example, third or fourth gear, by use of the manual valve in combination with an actuator mode valve. The clutch priority valve, when actuated, is also operable to disengage a torque converter clutch.