Geartrain

Differential, Torque Converter Housing, And Oil Pump (Part 1 Of 2):

Differential, Torque Converter Housing, And Oil Pump (Part 2 Of 2):

Differential, Torque Converter Housing, And Oil Pump

Output Shaft, Idler Gear, 2-4 Band, 2-4 Servo, Valve Body, and Reduction Gear (Part 1 Of 3):

Output Shaft, Idler Gear, 2-4 Band, 2-4 Servo, Valve Body, and Reduction Gear (Part 2 Of 3):

Output Shaft, Idler Gear, 2-4 Band, 2-4 Servo, Valve Body, and Reduction Gear (Part 3 Of 3):

Output Shaft, Idler Gear, 2-4 Band, 2-4 Servo, Valve Body, and Reduction Gear

Reverse Clutch, 3-4 Clutch, Low/Reverse Clutch, Front And Rear Planets, Forward Clutch, And Coasting Clutch (Part 1 Of 3):

Reverse Clutch, 3-4 Clutch, Low/Reverse Clutch, Front And Rear Planets, Forward Clutch, And Coasting Clutch (Part 2 Of 3):

Reverse Clutch, 3-4 Clutch, Low/Reverse Clutch, Front And Rear Planets, Forward Clutch, And Coasting Clutch (Part 3 Of 3):

Reverse Clutch, 3-4 Clutch, Low/Reverse Clutch, Front And Rear Planets, Forward Clutch, And Coasting Clutch

The 4F20E transaxle uses two interconnected planetary gearsets to provide four forward speeds plus reverse. The planetary gearset has three basic components:
- Sun gear.
- Planet.
- Ring gear

The 4F20E automatic transaxle planetary gearset has five components. These are:
- Primary sun gear.
- Rear sun gear.
- Front planet.
- Rear planet.
- Ring gear.

The variety of ways in which these five components may be driven or held produces the different gear ratios as well as both forward and reverse motion. The 4F20E transaxle uses eight apply devices to drive or hold the planetary gearset components. These eight apply devices are:
- Forward clutch.
- Coasting clutch.
- Forward one-way clutch (sprag).
- 2-4 band.
- Low one-way clutch (roller).
- Low/Reverse clutch.
- 3-4 crutch.
- Reverse clutch.

In addition to these eight apply devices, the 4F20E transaxle geartrain includes the:
- Parking pawl.
- Idler gear.
- Reduction gear.
- Differential assembly.

Geartrain Automatic Transaxle Operating Characteristics Application Chart:

Under certain conditions the transaxle will downshift automatically to a lower gear range (without moving the gearshift lever). There are three categories of automatic downshifts: coastdown, torque demand, and forced or kickdown shifts.
- Coastdown: The coastdown downshift automatically occurs as the name indicates, when the vehicle is coasting down to a stop.
- Torque Demand: The torque demand downshift automatically occurs during part throttle acceleration when the demand for torque is greater than the engine can provide at that gear ratio. The transaxle will disengage the torque converter clutch (if applied) to provide added acceleration.
- Kickdown: For maximum acceleration, the driver can force an automatic downshift by pressing the accelerator pedal to the floor. A forced downshift into second gear is possible below 88 km/h (55 MPH). Below approximately 40 km/h (25 MPH) a forced kickdown to first gear will occur. For all shift speeds, specifications are subject to variation due to tire size and engine calibration requirements.

Forward Clutch
The forward clutch is applied in all forward gears. The forward clutch connects the input shaft to the ring gear through the forward one-way clutch (sprag).

Coasting Clutch
The coasting clutch is applied in all forward gears only when the overdrive control (O/D control) switch is OFF. The coasting clutch connects the input shaft to the ring gear bypassing the forward one-way clutch (sprag). The coasting clutch allows for engine braking upon deceleration.

Forward One-Way Clutch (Sprag)
The forward one-way clutch (sprag) is engaged in all forward gears during acceleration. The forward one-way (sprag) overruns during deceleration. The forward one-way clutch (sprag) connects the forward clutch to the ring gear during acceleration.

2-4 Band
The 2-4 band is applied by the 2-4 servo in second and fourth gears. The 2-4 band holds the primary sun gear stationary by locking it to the transaxle case.





2-4 Servo
The 2-4 servo applies the 2-4 band in second and fourth gears. The 2-4 servo includes a second apply piston that applies the 2-4 band in second gear. Fourth gear is applied by a separate fourth apply piston that applies in fourth gear only.

Low One-Way Clutch (Roller)
The low one-way clutch (roller) is engaged in first gear, with the exception of MANUAL LOW (1). In MANUAL LOW (1), the low one-way clutch (roller) is locked out by the application of the low/reverse clutch. The low one-way clutch (roller) prevents the front planet (from rotating counterclockwise. The low one-way clutch (roller) overruns during deceleration in first gear, with the exception of MANUAL LOW (1).

Low/Reverse Clutch
The low/reverse clutch is applied in MANUAL LOW first gear and reverse gears only. The low/reverse clutch holds the front planet stationary by locking it to the transaxle case.

3-4 Clutch
The 3-4 clutch is applied in third and fourth (overdrive) gears only. The 3-4 clutch drives the front planet directly from the input shaft.

Reverse Clutch
The reverse clutch is applied in reverse gear only. The reverse clutch drives the primary sun gear directly from the input shaft.

Parking Pawl
The parking pawl locks the idler gear to the transaxle case.





Idler Gear
The idler gear is driven by the output shaft and is attached to the reduction gear. The reduction gear drives the final drive ring gear, part of the differential. The idler gear also provides a gear for the parking pawl to lock the final drive from rotating.





Reduction Gear
The reduction gear connects the output shaft to the final drive ring gear and provides gear reduction.

Differential Assembly
The differential assembly drives the front wheel driveshaft and joints and allows the front wheel driveshaft and joints to turn at different speeds.