Geartrain

Geartrain

Power is transmitted from the torque converter to the planetary gearsets through the input shaft. Bands and clutches are used to hold and drive certain combinations of gearsets. This results in 5 forward ratios and 1 reverse ratio, which are transmitted to the output shaft.






Planetary Gearset - Front

For component location, refer to Transmission Assembly.

The planetary gear front carrier is driven by the input shaft.

- The front planetary gearset carrier drives the center shaft via the Overdrive (O/D) One-Way Clutch (OWC) in 1st, 3rd and 4th gears.
- In 2nd, the front sun gear is held causing the pinion gears to rotate around the front sun gear.
- The pinion gears, in turn, drive the front ring gear and, with the front band applied, results in a 2nd gear ratio of 1.87 to 1.
- In 5th, the front sun gear is held, causing the pinion gears to rotate around the front sun gear.
- The pinion gears, in turn, drive the front ring gear and, with the intermediate band applied, results in a 5th O/D gear ratio of 0.75 to 1.
- The front planetary gearset is internally splined to the coast clutch for engine braking.


Planetary Gearset - Forward

For component location, refer to Transmission Assembly.

The forward planetary gearset is splined to the output shaft.

- The forward planetary gearset is driven by the forward ring gear when the forward clutch is applied.
- The forward planetary gearset pinions drive the forward sun gear.
- The forward sun gear is splined to the input shell.


Planetary Gearset - Low/Reverse

For component location, refer to Transmission Assembly.

The low/reverse planetary gearset is connected to the reverse brake drum by lugs from the low/reverse brake drum to the lugs of the low/reverse planetary gearset.

- The low/reverse planetary gearset is driven by the forward sun gear which is splined to the input shell.
- The splines of the forward sun gear drive the pinions in the low/reverse planetary gearset.
- The pinions of the low/reverse planetary gearset drive the output shaft ring gear and output shaft hub which is splined to the output shaft.
- The low/reverse planetary gearset is held by the low OWC in the low/reverse brake drum, when the low/reverse band is applied.


Input Shaft

For component location, refer to Transmission Assembly.

The input shaft is supported by 2 bushings in the stator support.

- End positioning of the input shaft is controlled by the splines in the converter turbine and the front planetary carrier.


Output Shaft

For component location, refer to Transmission Assembly.

The output shaft is supported by a bearing in the case and by the slip yoke bushing in the extension housing. End positioning is controlled by the parking pawl gear and snap ring shoulder and by the reverse ring gear hub and snap ring.