GM Service Manual Online
For 1990-2009 cars only

Position

Solenoid

Clutch

Brake

1-Way Clutch

Shift 1

Shift 2

Timing

C1

C2

C3

B1

B2

B3

F1

F2

D

2nd

ON

OFF

OFF

ON

OFF

OFF

OFF

ON

OFF

ON

OFF

2

2nd

ON

OFF

OFF

ON

OFF

OFF

ON

ON

OFF

ON

OFF


Object Number: 1225589  Size: LF

A. Front Planetary Gear

B. Rear Planetary Gear

D - 2nd Gear

  1. The input shaft rotates clockwise.
  2. The forward clutch (C1) operates. Connect the input shaft to the front sun gear.

  3. The front sun gear rotates clockwise.
  4. The planetary short pinion rotates itself counterclockwise.
  5. The planetary long pinion rotates itself clockwise.
  6. The rear planetary sun gear is going to rotate counterclockwise.
  7. The 2nd brake (B2) and 1-way clutch No. 1 operates, lock counterclockwise rotation of the rear planetary sun gear.

  8. The planetary carrier revolves clockwise due to reaction force of the planetary long pinion.
  9. The ring gear rotates clockwise.
  10. The counter drive gear rotates clockwise for the ring gear and one.
  11. The counter driven gear rotates counterclockwise.
  12. The differential gear drive pinion rotates counterclockwise for the counter driven gear and one.
  13. The differential gear rotates clockwise.

Engine Brake

  1. The counter drive gear and planetary ring gear rotates counterclockwise.
  2. The planetary long pinion rotates itself counterclockwise.
  3. The planetary short pinion rotates itself clockwise.
  4. The rear sun gear rotates clockwise due to rotation itself counterclockwise of the planetary long pinion, but the driving force loses due to free to 1-way clutch No. 1 (F1). Therefore the engine brake does not operate.