Description And Operation: Geartrain: Notes
Power is transmitted from the torque converter to the Ravigneaux geartrain components through the input shaft and forward clutch cylinder.
- The geartrain contains a Ravigneaux planetary set connected by dual pinion gears.
- By holding or driving certain components of the gearset, four forward ratios and one reverse ratio are obtained and transmitted to the output shaft.
The ratios are as follows:
- Components of the geartrain can be held by bands or clutches and driven by clutches only.
The 4R70W uses:
- Two bands.
- Two one-way clutches (one roller, one mechanical diode).
- Four friction clutches.