One-Way Clutch

The one-way clutch is located between the countershaft 1st gear and the park gear. The park gear is splined with the countershaft. The countershaft 1st gear engages the outer race surface of the one-way clutch, and the park gear engages the inner race surface of the one-way clutch. The one-way clutch locks when power is transmitted from the secondary shaft 1st gear to the countershaft 1st gear. The 1st clutch and 1st gear remain engaged in 1st, 2nd, 3rd, 4th, 5th, and 6th gear ranges in D or S. However, the one-way clutch disengages when the 2nd, 3rd, 4th, 5th, or 6th clutches and gears are applied in D or S. This is because the rotational speed of the countershaft exceeds that of 1st gear, which causes the one-way clutch to free-wheel with the 1st clutch still engaged.