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 five forward ratios and one reverse ratio, which are transmitted to the output shaft and differential.





The planetary gear front carrier is driven by the input shaft. See the disassembled view.
- The front planetary gearset carrier drives the center shaft via the overdrive one-way clutch in 1st, 2nd, and 3rd and 4th gears.
- In 5th, the 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 resulting in 5th (overdrive) gear ratio of 0.75 to 1.
- The front planetary gearset is internally splined to the coast clutch for engine braking.

Planetary Gearset - Forward








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

Planetary Gearset-Low/Reverse





The reverse planetary gearset is connected to the reverse brake drum by lugs from the reverse brake drum to the lugs of the reverse planetary gearset.
- The reverse planetary gearset is driven by the for ward 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 reverse planetary gearset drive the output shaft ring gear and output shaft hub which is splined to the output shaft.
- The reverse planetary gearset is held via the low one-way clutch in the reverse brake drum, when the reverse band is applied.

Input Shaft
The input shaft is supported by two 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
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.