Low One-Way Clutch Construction/Operation: Operation

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The low one-way clutch outer race (front planetary carrier) rotates clockwise (seen from the torque converter side) freely, but the sprags rise to lock the rotation when the outer race tries to rotate counter clockwise.
The low one-way clutch locks the counter clockwise rotation of the front planetary carrier, and also locks the counterclockwise revolution of the rear planetary carrier via the low clutch.
NOTE:
- All rotation directions are as viewed from the torque converter.

Fig 1: Identifying Low One-Way Clutch Outer Race

Courtesy of MAZDA MOTORS CORP.