Geartrain

Power is transmitted from the torque converter to the Ravigneaux geartrain components through the input shaft and forward clutch cylinder.
- The geartrain contains a compound 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:

Gear Ratio
1st 2.84 to 1
2nd 1.55 to 1
3rd 1.00 to 1
4th 0.70 to 1
Reverse 2.32 to 1

- Components of the geartrain can be held by bands or clutches and driven by clutches only.
The 4R70W uses:
- two bends.
- two one-way clutches (one roller, and one mechanical diode).
- four friction clutches.