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Section 378 (Automatic Transmission - 4R70W): Disassembly: Transmission: Procedure

WARNING: This page is about a different car, the 2002 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the vent tube, if equipped.
    1. Remove the bolt.
    2. Remove the vent tube.
      Fig 1: Removing Vent Tube
      G01966215Courtesy of FORD MOTOR CO.
  2. Remove the special tool.
    Fig 2: Removing Special Tool
    G01966216Courtesy of FORD MOTOR CO.
  3. Using the special tools, remove torque converter.
    Fig 3: Removing Torque Converter
    G01966217Courtesy of FORD MOTOR CO.
  4. Using the special tool, mount the transmission to the bench.
    Fig 4: Mounting Transmission To Bench
    G01966218Courtesy of FORD MOTOR CO.
    5. NOTE: If the transmission fluid pan gasket is not damaged, it may be reused.
  5. Remove the transmission fluid pan and transmission fluid pan gasket.
    1. Remove the bolts.
    2. Remove the transmission fluid pan and transmission fluid pan to case gasket.
      Fig 5: Removing Transmission Fluid Pan
      G01966219Courtesy of FORD MOTOR CO.
  6. Clean the transmission fluid pan and pan magnet.
    Fig 6: Locating Transmission Fluid Pan And Pan Magnet
    G01966220Courtesy of FORD MOTOR CO.
    7. CAUTION: If installing a new filter, and grommet remains in the main control bore, carefully use a small screwdriver to remove the grommet. Use care not to damage the main control bore.
    NOTE: If transmission is being repaired for a contamination-related failure, use a new filter and seal. The filter may be reused if no excessive contamination is present.
    Fig 7: Removing Fluid Filter And Grommet
    G01966221Courtesy of FORD MOTOR CO.
  7. Remove the fluid filter and grommet.
    8. CAUTION: Do not pull on the plastic lead frame. This may cause damage to the connector ends. Carefully pry up on the locking tabs to disconnect the solenoids. Disconnect the molded lead frame from the solenoids.
  8. Disconnect the molded lead frame from the solenoids.
    1. Disconnect the shift solenoid SSA and SSB.
    2. Disconnect the torque converter clutch (TCC).
    3. Disconnect the electronic pressure control (EPC) solenoid.
    4. Disconnect the bulkhead inter-connector.
      Fig 8: Disconnecting Molded Lead Frame From Solenoids
      G01966222Courtesy of FORD MOTOR CO.
  9. Remove the output shaft speed (OSS) sensor.
    1. Remove the bolt.
    2. Remove the OSS sensor.
      Fig 9: Removing Output Shaft Speed (OSS) Sensor
      G01966223Courtesy of FORD MOTOR CO.
    10. CAUTION: Discard the manual lever shaft outer nut. Do not reuse.
  10. Remove the outer manual control lever.
    1. Remove the manual lever shaft outer nut.
    2. Remove the outer manual control lever.
      Fig 10: Removing Outer Manual Control Lever
      G01966224Courtesy of FORD MOTOR CO.
  11. Remove the digital transmission range (TR) sensor.
    1. Remove the bolts.
    2. Remove the digital TR sensor.
      Fig 11: Removing Digital Transmission Range (TR) Sensor
      G01966225Courtesy of FORD MOTOR CO.
  12. Remove the manual control valve detent lever spring.
    1. Remove the bolt.
    2. Remove the manual control valve detent lever spring.
      Fig 12: Removing Manual Control Valve Detent Lever Spring
      G01966226Courtesy of FORD MOTOR CO.
  13. Remove the 24 main control valve body bolts and the main control valve body.
    Fig 13: Removing 24 Main Control Valve Body Bolts And Main Control Valve Body
    G01966227Courtesy of FORD MOTOR CO.
  14. Remove the discard the pump outlet screen.
    Fig 14: Removing Pump Outlet Screen
    G01966228Courtesy of FORD MOTOR CO.
    15. NOTE: Use a shop cloth to protect the transmission case surface.
    Fig 15: Removing Manual Lever Shaft Retaining Pin
    G01966229Courtesy of FORD MOTOR CO.
  15. Remove the manual lever shaft retaining pin.
  16. Remove the manual lever shaft inner nut.
    • Slide the manual control lever shaft out of the case while removing the inner nut.
      Fig 16: Removing Manual Lever Shaft Inner Nut
      G01966230Courtesy of FORD MOTOR CO.
  17. Remove the parking lever actuating rod.
    1. Remove the manual valve detent.
    2. Remove the parking lever actuating rod.
      Fig 17: Removing Parking Lever Actuating Rod
      G01966231Courtesy of FORD MOTOR CO.
    18. CAUTION: Use care not to damage the manual control lever shaft bore. If the bore is damaged the new seal may leak.
    Fig 18: Removing Manual Control Lever Shaft Seal
    G01966232Courtesy of FORD MOTOR CO.
  18. Remove the manual control lever shaft seal.
  19. Remove the EPC solenoid.
    1. Remove the bolt and EPC solenoid bracket.
    2. Remove the EPC solenoid.
      Fig 19: Removing EPC Solenoid
      G01966233Courtesy of FORD MOTOR CO.
  20. Remove the 2-3 accumulator spring retainer.
    Fig 20: Removing 2-3 Accumulator Spring Retainer
    G01966234Courtesy of FORD MOTOR CO.
  21. Remove the 2-3 accumulator piston.
    1. Remove the 2-3 accumulator spring.
    2. Remove the 2-3 accumulator piston.
      Fig 21: Removing 2-3 Accumulator Piston
      G01966235Courtesy of FORD MOTOR CO.
  22. Using the special tool, remove the reverse band servo retaining ring.
    Fig 22: Removing Reverse Band Servo Retaining Ring
    G01966236Courtesy of FORD MOTOR CO.
  23. Remove the reverse band servo.
    1. Remove the reverse band servo cover.
    2. Remove the reverse band servo piston and rod assembly.
    3. Remove the reverse band servo spring.
      Fig 23: Removing Reverse Band Servo
      G01966237Courtesy of FORD MOTOR CO.
    24. NOTE: If tool is not available, extreme care must be taken. Spring pressure will force overdrive servo piston assembly out of case. Case bore damage may result from trying to pry on internal retaining ring.
    Fig 24: Removing Overdrive Servo Piston Retainer
    G01966238Courtesy of FORD MOTOR CO.
  24. Using the special tool, compress the piston spring, then remove the overdrive servo piston retainer.
  25. Remove the overdrive servo piston.
    1. Remove the overdrive servo piston.
    2. Remove the overdrive servo piston return spring.
      Fig 25: Removing Overdrive Servo Piston
      G01966239Courtesy of FORD MOTOR CO.
  26. Compress the 1-2 accumulator cover and remove the 1-2 accumulator piston retaining ring.
    Fig 26: Removing 1-2 Accumulator Piston Retaining Ring
    G01966240Courtesy of FORD MOTOR CO.
  27. Remove the 1-2 accumulator upper spring.
    1. Remove the 1-2 accumulator spring cover.
    2. Remove the inner and outer 1-2 accumulator springs.
    3. Remove the 1-2 accumulator.
    4. Remove the 1-2 accumulator upper spring.
      Fig 27: Removing 1-2 Accumulator Upper Spring
      G01966241Courtesy of FORD MOTOR CO.
  28. Using the special tools, remove the extension housing seal.
    Fig 28: Removing Extension Housing Seal
    G01966242Courtesy of FORD MOTOR CO.
    29. NOTE: These bolts have been coated with a sealant. High break torque may be required to remove these bolts.
  29. Remove the extension housing.
    1. Remove the four bolts and two nuts
    2. Remove the extension housing and the extension housing gasket.
      Fig 29: Removing Extension Housing
      G01966243Courtesy of FORD MOTOR CO.
  30. Remove the parking pawl.
    1. Remove the parking pawl shaft.
    2. Remove the parking pawl return spring.
    3. Remove the parking pawl.
      Fig 30: Removing Parking Pawl
      G01966244Courtesy of FORD MOTOR CO.
  31. Rotate the transmission to the vertical position with the output shaft towards the floor.
    32. CAUTION: Extreme care must be taken during transmission connector removal. Do not pull on wires, or use a hammer on the connector body.
    Fig 31: Removing Connector Out Through Bottom Of Case
    G01966245Courtesy of FORD MOTOR CO.
  32. Place a screwdriver on the flat portion of the connector and push the connector out through the bottom of the case.
  33. Using the special tools remove the front pump seal.
    Fig 32: Removing Front Pump Seal
    G01966246Courtesy of FORD MOTOR CO.
    34. NOTE: These bolts have been coated with sealant. High break torque may be required to remove the bolts.
    Fig 33: Removing Front Bolts
    G01966247Courtesy of FORD MOTOR CO.
  34. Remove the front bolts.
  35. Using the special tools, remove the front pump support.
    Fig 34: Removing Front Pump Support
    G01966248Courtesy of FORD MOTOR CO.
  36. Remove and discard the pump gasket.
  37. If equipped, remove the intermediate clutch anti-rattle clip.
    Fig 35: Removing Intermediate Clutch Anti-Rattle Clip
    G01966249Courtesy of FORD MOTOR CO.
    38. CAUTION: Remove the assembly carefully to prevent damage to the overdrive band friction material by the reverse clutch drive lugs.
  38. Remove the following components as an assembly:
    • intermediate clutch pack.
    • intermediate one-way clutch.
    • reverse clutch.
    • forward clutch assembly.
      Fig 36: Removing Intermediate Clutch Pack And Component
      G01966250Courtesy of FORD MOTOR CO.
  39. Disengage and remove the overdrive band.
    Fig 37: Removing Overdrive Band
    G01966251Courtesy of FORD MOTOR CO.
  40. Remove the forward clutch hub and the No. 3 forward clutch hub front bearing.
    Fig 38: Removing Forward Clutch Hub And No 3 Forward Clutch Hub Front Bearing
    G01966252Courtesy of FORD MOTOR CO.
  41. Remove the intermediate stub shaft.
    Fig 39: Removing Intermediate Stub Shaft
    G01966253Courtesy of FORD MOTOR CO.
  42. Align the reverse sun shell with the overdrive band anchor pin for removal.
    Fig 40: Aligning Reverse Sun Shell With Overdrive Band Anchor Pin For Removal
    G01966254Courtesy of FORD MOTOR CO.
  43. Remove the following components as an assembly:
    • Forward clutch sun gear.
    • No. 5 forward clutch sun gear bearing.
    • Reverse clutch sun gear.
    • No. 4 forward clutch hub bearing.
      Fig 41: Removing Forward Clutch Sun Gear And No. 5 Clutch Sun Gear Bearing
      G01966255Courtesy of FORD MOTOR CO.
  44. Remove the center support retaining ring and note location for assembly.
    Fig 42: Removing Center Support Retaining Ring
    G01966256Courtesy of FORD MOTOR CO.
  45. Remove the case to planet support spring.
    Fig 43: Removing Case To Planet Support Spring
    G01966257Courtesy of FORD MOTOR CO.
  46. Remove the planetary gear support and planetary as an assembly.
    Fig 44: Removing Planetary Gear Support And Planetary As An Assembly
    G01966258Courtesy of FORD MOTOR CO.
  47. Remove the reverse clutch band.
    Fig 45: Removing Reverse Clutch Band
    G01966259Courtesy of FORD MOTOR CO.
  48. Remove the retaining ring.
    Fig 46: Removing Retaining Ring
    G01966260Courtesy of FORD MOTOR CO.
  49. Remove the direct clutch pack.
    Fig 47: Removing Direct Clutch Pack
    G01966261Courtesy of FORD MOTOR CO.
  50. Remove the No. 8 bearing.
    Fig 48: Removing No. 8 Bearing
    G01966262Courtesy of FORD MOTOR CO.
  51. Remove the output shaft, output shaft ring gear assembly and direct clutch.
    Fig 49: Removing Output Shaft Ring Gear Assembly And Direct Clutch
    G01966263Courtesy of FORD MOTOR CO.
  52. Remove the No. 9 case rear bearing.
    Fig 50: Removing No. 9 Case Rear Bearing
    G01966264Courtesy of FORD MOTOR CO.
  53. Inspect and if necessary, using the special tools, remove the rear case bushing.
    Fig 51: Removing Rear Case Bushing
    G01966265Courtesy of FORD MOTOR CO.
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