Automatic Transmission Overhaul - 4F50N: Assembly: Transaxle

Fig 1: Identifying Special Tools (1 Of 6)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Special Tools (2 Of 6)

Courtesy of FORD MOTOR CO.

Fig 3: Identifying Special Tools (3 Of 6)

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Fig 4: Identifying Special Tools (4 Of 6)

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Fig 5: Identifying Special Tools (5 Of 6)

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Fig 6: Identifying Special Tools (6 Of 6)

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Install the parking pawl assembly.
1. Install the parking pawl and return spring.
2. Install the parking pawl shaft.
Fig 7: Installing Parking Pawl Assembly
Courtesy of FORD MOTOR CO.
Install the park pawl roll pin.

Fig 8: Installing Park Pawl Roll Pin
Courtesy of FORD MOTOR CO.
Using the special tool, install the cup plug.

Fig 9: Installing Cup Plug
Courtesy of FORD MOTOR CO.
Using the special tools, install the new drive sprocket bearing, if it was removed.

Fig 10: Installing New Drive Sprocket Bearing
Courtesy of FORD MOTOR CO.

NOTE: The bolt holes are offset and the drive sprocket can only be aligned one way.

Fig 11: Installing Drive Sprocket Support

Courtesy of FORD MOTOR CO.

Install the drive sprocket support.
Install the bolts.

Fig 12: Installing Bolts
Courtesy of FORD MOTOR CO.
Using the special tool, install the converter impeller hub seal.

Fig 13: Installing Converter Impeller Hub Seal
Courtesy of FORD MOTOR CO.
Install the differential carrier thrust bearing.
1. Install the differential carrier thrust washer.
2. Install the differential carrier thrust bearing and race (tabs down).
Fig 14: Installing Differential Carrier Thrust Bearing
Courtesy of FORD MOTOR CO.
Install the final drive ring gear.

Fig 15: Installing Final Drive Ring Gear
Courtesy of FORD MOTOR CO.
Install the rear planet support spacer.

Fig 16: Installing Rear Planet Support Spacer
Courtesy of FORD MOTOR CO.
Install the final drive differential assembly.

Fig 17: Installing Final Drive Differential Assembly
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Align the rear lube tube holes in the case window.

Fig 18: Aligning The Rear Lube Tube Holes In The Case Window
Courtesy of FORD MOTOR CO.

NOTE: The retaining ring must be correctly installed.

Fig 19: Installing Beveled Retaining Ring

Courtesy of FORD MOTOR CO.

Fig 20: Identifying Proper Retaining Ring Installation

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Using the special tool install the beveled retaining ring.

CAUTION: If support is not visible on inside diameter of the retaining ring the low/intermediate piston could be damaged.

Fig 21: Identifying Retaining Ring Seats Properly In Case Groove With The Bevel Down

Courtesy of FORD MOTOR CO.

Make sure that the beveled retaining ring seats properly in case groove with the bevel down and final drive support must be visible on the inside diameter of the retaining ring but must not seat against the case wall.
Place a screwdriver into the differential case and pry up to make sure that the retaining ring is fully seated in the top of the case groove.

Fig 22: Installing A Screwdriver Into The Differential Case & Prying Up
Courtesy of FORD MOTOR CO.
Install the special tools.

Fig 23: Installing Special Tool
Courtesy of FORD MOTOR CO.
Remove the No. 15 needle bearing.

Fig 24: Removing No. 15 Needle Bearing
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NOTE: The dial indicator extension rod must set on the No. 15 bearing surface.

Fig 25: Installing Special Tool

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Install the special tools.
Install the special tools and zero the dial indicator.

Fig 26: Installing Dial Indicator
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Tighten the bolt.

Fig 27: Tightening Bolt
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Read and record the dial indicator reading. If the dial indicator reading indicates movement more than the specification the next larger beveled ring retainer will need to be used.

Fig 28: Measuring To Select Correct Beveled Retaining Ring
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Select the correct beveled retaining ring.

Fig 29: Beveled Retaining Ring Specification Table
Courtesy of FORD MOTOR CO.

NOTE: Make sure the No. 15 needle bearing is on the rear planet support hub and the black plastic No. 15 thrust washer is in place on top of the low/intermediate clutch spring retainer.

Fig 30: Installing No. 15 Thrust Bearing

Courtesy of FORD MOTOR CO.

Install the No. 15 thrust bearing.
Check the clearance for the No. 16 thrust washer. Mount the Dial Indicator with the stylus on the end of the output shaft. Zero the dial indicator.

Fig 31: Mounting The Dial Indicator With The Stylus On The End Of The Output Shaft
Courtesy of FORD MOTOR CO.
Tighten the bolt. Read and record the dial indicator reading.

Fig 32: Tightening Bolt
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NOTE: The beveled retaining ring and the rear planet support must be removed to change the No. 16 thrust race.

Fig 33: Reading Dial Indicator

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Fig 34: No. 16 Thrust Race (Washer) Table

Courtesy of FORD MOTOR CO.

If the clearance is not within specification a thicker or thinner washer will need to be added.
Install the low-intermediate one-way clutch assembly.

Fig 35: Installing Low-Intermediate One-Way Clutch Assembly
Courtesy of FORD MOTOR CO.

NOTE: The friction plate internal splines will center the one-way clutch.

Fig 36: Installing Low-Intermediate Clutch Pressure Plate

Courtesy of FORD MOTOR CO.

Install the low-intermediate clutch pressure plate.
1. Install the low-intermediate clutch wave spring.
2. Install the low-intermediate clutch pack.
3. Install the low-intermediate clutch pressure plate.

CAUTION: Make sure that the retaining ring is seated in the case groove.

Fig 37: Installing Low-Intermediate Clutch Retaining Ring

Courtesy of FORD MOTOR CO.

Install the low-intermediate clutch retaining ring.

WARNING: To prevent injury, wear eye protection when using pressurized air.

NOTE: Be sure the pressurized air is dry and regulated at 276 kPa (40 psi).

Fig 38: Applying Regulated Air Pressure To The Low-Intermediate Apply Port

Courtesy of FORD MOTOR CO.

Apply regulated air pressure to the low-intermediate apply port. Make sure that the piston moves and no air is leaking past the piston seal.
Measure the clearance between the clutch pressure plate and the low-intermediate clutch retainer. If the clearance is not within specification a thicker or thinner retainer may be needed.

Fig 39: Measuring Clearance Between Clutch Pressure Plate & Low-Intermediate Clutch Retainer
Courtesy of FORD MOTOR CO.

Fig 40: Selective Retaining Rings Table
Courtesy of FORD MOTOR CO.
Install the coast band.
1. Install the coast band.
2. Align the anchor pin pocket with the anchor pin in the case.
Fig 41: Installing Coast Band
Courtesy of FORD MOTOR CO.
Install the low-intermediate drum. Rotate the low-intermediate drum and sun gear into the low-intermediate one-way clutch.

Fig 42: Installing Low-Intermediate Drum
Courtesy of FORD MOTOR CO.
Install the park rod abutment and make sure that the park pawl moves freely.

Fig 43: Installing Park Rod Abutment
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Install the coast band piston cover.
1. Install the coast band servo piston spring.
2. Install the coast band servo piston.
3. Install the coast band servo piston cover.
Fig 44: Installing Coast Band Piston Cover
Courtesy of FORD MOTOR CO.
Using the special tool, install the coast servo cover retaining ring.

Fig 45: Installing Coast Servo Cover Retaining Ring
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Using the special tools, install the front planetary/reverse clutch assembly.

Fig 46: Installing The Front Planetary/Reverse Clutch Assembly
Courtesy of FORD MOTOR CO.
Make sure that the reverse clutch cylinder apply tube hole is aligned with the case hole. Remove the tool.

Fig 47: Identifying That Reverse Clutch Cylinder Apply Tube Hole Is Aligned With Case Hole
Courtesy of FORD MOTOR CO.
Loosely install the reverse clutch anchor pin.

Fig 48: Installing Reverse Clutch Anchor Pin
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Using the special tool install the forward/intermediate clutch assembly. Align the shell and sun gear into the front planet.

Fig 49: Installing Forward/Intermediate Clutch Assembly
Courtesy of FORD MOTOR CO.
Install the overdrive band.

Fig 50: Installing Overdrive Band
Courtesy of FORD MOTOR CO.

NOTE: The foot of the overdrive retainer goes down against the band.

Fig 51: Installing Overdrive Band Anchor Strut

Courtesy of FORD MOTOR CO.

Install the overdrive band anchor strut with the cross hairs facing up.
Remove the No. 8 sprocket thrust washer and the No. 9 bearing and race from the driven sprocket support.
1. Remove the No. 9 bearing and race.
2. Remove the No. 8 sprocket support.
Fig 52: Removing No. 9 Bearing, Race & No. 8 Sprocket Support
Courtesy of FORD MOTOR CO.
Install only the No. 9 needle bearing with the outer lip up.

Fig 53: Installing No. 9 Needle Bearing With Outer Lip Up
Courtesy of FORD MOTOR CO.
Install the special tool over the output shaft until it is fully seated on to the No. 9 needle bearing.

Fig 54: Installing Special Tool Over Output Shaft
Courtesy of FORD MOTOR CO.
Install the special tool to make the measurements.

Fig 55: Installing special tool
Courtesy of FORD MOTOR CO.
When taking the measurement, record readings on both sides of the output shaft 180 degrees apart from each other. Add both readings and divide by two to obtain reading A.

Fig 56: Measuring To Select No. 8 Thrust Washer
Courtesy of FORD MOTOR CO.

NOTE: Reading A and Dimension C from the chart will be used in the selection of the No. 5 thrust washer.

Fig 57: No. 8 Thrust Washer Selection Chart (1 Of 2)

Courtesy of FORD MOTOR CO.

Fig 58: No. 8 Thrust Washer Selection Chart (2 Of 2)

Courtesy of FORD MOTOR CO.

Use the reading A to select the correct No. 8 thrust washer from the chart.
Remove the special tools.

Fig 59: Removing Special Tools
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Install the special tools to make the measurements.

Fig 60: installing special tools to make measurements
Courtesy of FORD MOTOR CO.
Measure down to the No. 5 thrust washer mating surface of the overdrive drum. Take another reading on the other side of the drum 180 degrees from the first one. Add both readings and divide by two to obtain reading B.

Fig 61: Measuring To Select No. 5 Thrust Washer
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Remove the special tools.

Fig 62: Removing Special Tools
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NOTE: Reading A was obtained during No. 8 thrust washer selection. Dimension C is found on the No. 8 thrust washer selection chart.

Fig 63: Formula To Select No. 5 Support Thrust Washer

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Subtract reading A from Reading B and add the difference between A and B to dimension C. Record this reading as D.
Use Reading D to select the correct No. 5 thrust washer.

Fig 64: No. 5 Support Thrust Washer Chart
Courtesy of FORD MOTOR CO.

NOTE: Use petroleum jelly to hold the No. 5 thrust washer in place.

Fig 65: Installing No. 5 Front Support Thrust Washer

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Install the No. 5 front support thrust washer.

CAUTION: The No. 9 direct hub needle bearing may still be inside the transaxle from the No. 8 driven sprocket support thrust washer selection procedure. Use petroleum jelly to hold bearing and washer in place.

Fig 66: Installing No. 8 Driven Sprocket Support Thrust Washer & No. 9 Direct Clutch Needle Bearing

Courtesy of FORD MOTOR CO.

Install the correct bearing.
1. Install the correct No. 8 driven sprocket support thrust washer.
2. Install the No. 9 direct clutch needle bearing.
Install the driven sprocket support assembly.

Fig 67: Installing Driven Sprocket Support Assembly
Courtesy of FORD MOTOR CO.
Install the neutral/drive accumulator cover.
1. Install the neutral/drive accumulator piston.
2. Install the neutral/drive accumulator spring.
  - The outer spring is yellow in color.
  - The inner spring is grey in color.
3. Install the neutral/drive accumulator cover.
Fig 68: Installing Neutral/Drive Accumulator Cover
Courtesy of FORD MOTOR CO.
Install the bolt.

Fig 69: Installing Bolt
Courtesy of FORD MOTOR CO.

NOTE: All the fluid supply tubes must have new O-rings installed.

Fig 70: Installing Fluid Supply Tubes

Courtesy of FORD MOTOR CO.

Install the fluid supply tubes.
Install the brackets.

Fig 71: Installing Brackets
Courtesy of FORD MOTOR CO.
Using the special tool, install the manual control lever shaft seal.

Fig 72: Installing Manual Control Lever Shaft Seal
Courtesy of FORD MOTOR CO.
Install the parking lever actuating rod.
- Push in on the park pawl.
- Slide down the parking lever actuating rod to fit in the park pawl.
Fig 73: Installing Parking Lever Actuating Rod
Courtesy of FORD MOTOR CO.

NOTE: The manual control valve detent lever must be installed with the shoulder and roll pin hole pointing toward the driven sprocket support.

Fig 74: Installing Manual Control Lever Shaft

Courtesy of FORD MOTOR CO.

Install the manual control lever shaft.

NOTE: Prior to installing the roll pins be sure that the manual control valve detent lever shoulder and roll pin hole is pointing toward the driven sprocket support.

Fig 75: Installing Roll Pins

Courtesy of FORD MOTOR CO.

Install the roll pins.

NOTE: Apply petroleum jelly to the drive sprocket thrust washer and driven sprocket thrust washer to hold them in place.

Fig 76: Installing Thrust Washers

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Install the thrust washers.
1. Install the No. 2 drive sprocket thrust washer.
2. Install the No. 4 driven sprocket thrust washer.

CAUTION: Be careful not to damage or bend the exciter tabs on the driven sprocket speed sensor wheel. The TSS sensor will not operate properly if the tabs are bent.

NOTE: Lower the assembly into the sprocket supports simultaneously.

Fig 77: Installing Drive Chain & Sprockets

Courtesy of FORD MOTOR CO.

Install the drive chain and sprockets.
Install the shift accumulator springs.
1. Install the 1-2 accumulator outer spring (no color or pink).
2. Install the 2-3 accumulator piston spring (orange).
3. Install the reverse shift accumulator spring.
4. Install the 3-4 accumulator spring (blue).
Fig 78: Installing Shift Accumulator Springs
Courtesy of FORD MOTOR CO.

NOTE: Make sure that the alignment pins are installed in case.

Fig 79: Installing New Chain Cover Gasket

Courtesy of FORD MOTOR CO.

Install the new chain cover gasket.
CAUTION: Be extremely careful not to damage the cast iron sealing ring.

NOTE: Use petroleum jelly to hold thrust washers in place during assembly.
1. Install the No. 1 thrust washer.
2. Install the No. 2 thrust washer.
3. Install the chain cover.
Fig 80: Installing No. 1 Thrust Washer, No. 2 Thrust Washer & Chain Cover
Courtesy of FORD MOTOR CO.

NOTE: After installing the chain cover the input shaft should have some end play and should rotate freely. Apply gentle downward pressure on the chain cover to overcome spring pressure.

Fig 81: Installing Two Chain Cover Bolts

Courtesy of FORD MOTOR CO.

Start two bolts.
Install the remaining bolts.

Fig 82: Installing Remaining Chain Cover Bolts
Courtesy of FORD MOTOR CO.
Install the bolts.

Fig 83: Installing Bolts
Courtesy of FORD MOTOR CO.

CAUTION: The test spring from the overdrive servo rod tool is plain in color and has a shorter free height than the operational spring. Extreme care must be used not to assemble the transaxle using the test spring.

Fig 84: Inspecting Spring Height

Courtesy of FORD MOTOR CO.

Inspect the spring height.
1. Test spring.
2. Original spring.
Overdrive servo travel check. Install the overdrive servo piston.
1. Install the test spring.
2. Install the overdrive servo piston.
Fig 85: Installing The Overdrive Servo Piston
Courtesy of FORD MOTOR CO.
Install the special tools.

Fig 86: Installing Special Tool
Courtesy of FORD MOTOR CO.
Using the special tools, tighten the center screw and zero out the dial indicator.

Fig 87: Setting Up Dial Indicator
Courtesy of FORD MOTOR CO.
Using the special tools, back off the center screw until the piston movement stops and read the dial indicator. The reading should be within specification. If the reading does not match the specification, see Fig 89 and determine which overdrive servo rod to use.

Fig 88: Measuring To Select Overdrive Piston Rod
Courtesy of FORD MOTOR CO.
If the overdrive servo travel was incorrect, install a new overdrive servo rod. Zero the dial indicator and repeat the above step to verify the amount of piston travel. If within specification, remove the tool and test spring.

Fig 89: Overdrive Piston Rod Selection Chart
Courtesy of FORD MOTOR CO.

CAUTION: Do not assemble the transaxle using the test spring.

Fig 90: Installing Overdrive Servo

Courtesy of FORD MOTOR CO.

Install the overdrive servo.
1. Install the overdrive servo spring.
2. Install the overdrive servo.
3. Install the overdrive servo cover and bolts.
Install the transmission test plate.

Fig 91: Installing Transmission Test Plate
Courtesy of FORD MOTOR CO.
WARNING: Wear safety glasses while carrying out this procedure to prevent personal injury.

NOTE: When applying regulated 276 kPa (40 psi) air pressure to the appropriate passage, a dull thud should be heard when the clutch or band applies. There should be no hissing sound when the clutch or band applies.

Fig 92: Identifying Test Passages (1 Of 2)
Courtesy of FORD MOTOR CO.

Fig 93: Identifying Test Passages (2 Of 2)
Courtesy of FORD MOTOR CO.

NOTE: Plugging the vent hole during the test will provide an inaccurate result.

Cover the vent hole in the test plate with a clean lint free shop towel to prevent spray when air is applied. Apply air pressure to the appropriate clutch ports.

CAUTION: The seals must be lapped correctly or internal leakage will occur.

Fig 94: Proper Seal Installation

Courtesy of FORD MOTOR CO.

Install the new Teflon(R) seals on the pump shaft.
Install the pump shaft.

Fig 95: Installing Pump Shaft
Courtesy of FORD MOTOR CO.
Install the manual valve detent lever.

Fig 96: Installing The Manual Valve Detent Lever
Courtesy of FORD MOTOR CO.
Install the main control valve body over the pump shaft and connect the main control valve actuating rod while pushing down until it is seated on the chain cover.

Fig 97: Installing Main Control Valve Body
Courtesy of FORD MOTOR CO.

CAUTION: Do not use the bolts to draw pump assembly and main control valve body onto the chain cover case. Component damage may occur.

Fig 98: Main Control Valve Body Torque Sequence

Courtesy of FORD MOTOR CO.

Use the valve body guide pins to install the pump assembly and main control valve body. Install the bolt and tighten in sequence.
Connect the connectors.

Fig 99: Connecting Solenoid Connectors
Courtesy of FORD MOTOR CO.

NOTE: The main control cover gasket is reusable if not torn or damaged.

Clean and inspect the gasket.

NOTE: The main control cover gasket is reusable if not torn or damaged.

Fig 100: View Of Pan & Gasket

Courtesy of FORD MOTOR CO.

Install the main control cover gasket onto the pan.

NOTE: The main control cover gasket is reusable if not torn or damaged.

Fig 101: Installing Main Control Cover

Courtesy of FORD MOTOR CO.

Install the main control cover.

NOTE: The transaxle side cover gasket is reusable if not torn or ripped.

Fig 102: View Of Structural Side Pan & Gasket

Courtesy of FORD MOTOR CO.

For vehicles equipped with a structural side pan, remove the gasket. Clean and inspect the gasket, reinstall into the pan.
For vehicles equipped with a structural side pan, install the pan.

Fig 103: Installing Structural Side Pan
Courtesy of FORD MOTOR CO.
For vehicles equipped with a structural side pan, install the mount.

Fig 104: Installing Structural Side Pan Mount
Courtesy of FORD MOTOR CO.
Tighten the reverse clutch anchor bolt.
1. Tighten the anchor bolt.
2. Tighten the locknut.
Fig 105: Tightening The Reverse Clutch Anchor Bolt
Courtesy of FORD MOTOR CO.
Install the new seal and gasket kit and seal assembly.

Fig 106: Installing Filter
Courtesy of FORD MOTOR CO.
Install the fluid pan magnet.

Fig 107: Identifying Pan Magnet
Courtesy of FORD MOTOR CO.

NOTE: The gasket is reusable if not damaged or torn.

Fig 108: Installing Transmission Fluid Pan

Courtesy of FORD MOTOR CO.

Install the transmission fluid pan and gasket.
Install the turbine shaft speed (TSS) sensor.
1. Install the sensor.
2. Install the bolt.
Fig 109: Installing TSS Sensor
Courtesy of FORD MOTOR CO.
Verify that the shift selector lever is in NEUTRAL.
Install the digital TR sensor and loosely install the bolts.

Fig 110: Installing Digital TR Sensor
Courtesy of FORD MOTOR CO.
Using the special tool, align the digital TR sensor and tighten the bolts.

Fig 111: Aligning TR Sensor
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Install the fluid filler tube with a new grommet.
1. Install the grommet.
2. Install the fluid filler tube.
3. Tighten the bolt.
Fig 112: Installing Fluid Filler Tube
Courtesy of FORD MOTOR CO.
Using the special tool install the LH output shaft seal.

Fig 113: Installing Left Side Output Shaft Seal
Courtesy of FORD MOTOR CO.
Using the special tool install the RH output shaft seal.

Fig 114: Installing Right Side Output Shaft Seal
Courtesy of FORD MOTOR CO.
Install the output shaft speed (OSS) sensor and reconnect the harness.

Fig 115: Installing OSS Sensor
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Install the output shaft speed (OSS) sensor cover.
1. Install the OSS cover.
2. Install the bolt.
3. Connect the connector to the bracket.
Fig 116: Installing OSS Sensor Cover
Courtesy of FORD MOTOR CO.
Install the identification tag, if removed.

Fig 117: Installing Identification Tag
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Using the special tools, install the torque converter.

Fig 118: Installing Torque Converter
Courtesy of FORD MOTOR CO.