Major Components

This transmission has the following major components:

• Transmission case with integral torque converter housing
• Torque converter
• Fluid pump
• Three drive clutches:
  • Forward clutch (A)
  • Direct clutch (B)
  • Overdrive clutch (E)
• Three brake clutches:
  • Intermediate clutch (C)
  • Low/reverse clutch (D)
  • One-Way Clutch (OWC)
• Two planetary gearsets:
  • Front single planetary gearset (1 sun gear, 1 carrier, 1 ring gear)
  • Rear ravigneaux planetary gearset (2 sun gears, 1 carrier with 2 sets of pinion gears and 1 ring gear)
• Main control:
  • Upper valve body
  • Lower valve body
  • Transmission Range (TR) sensor
  • Turbine Shaft Speed (TSS) sensor
  • Output Shaft Speed (OSS) sensor
  • Transmission Fluid Temperature (TFT) sensor
  • Line Pressure Control (LPC) solenoid
  • Torque Converter Clutch (TCC) solenoid
  • Five electronically controlled shift solenoids

In addition to the torque converter, the other shift elements are:

• three rotating multi-plate clutches: forward (A), direct (B) and overdrive (E).
• two fixed multi-disc brakes: intermediate (C) and low/reverse (D).

All gear shifts from 1st to 6th or from 6th to 1st are power-on overlapping shifts. That is, during the shift, one of the clutches must continue to transmit the drive at lower main pressure until the other clutch is able to accept the input torque.

The shift elements, clutches or brakes are engaged hydraulically. The transmission fluid pressure builds up between the cylinder and the piston, pressing the clutches together.

The purpose of these shift elements is to carry out in-load shifts with no interruption to traction.

Multi-plate clutches; forward, direct and overdrive, supply power from the engine to the planetary geartrain. Multi-disc brakes, intermediate and low/reverse, press against the transmission housing in order to achieve a torque reaction effect.