Section 600 (Automatic Transmission - 4R70W/4R75W): Disassembly: Transmission

SPECIAL TOOL(S) 

Fig 1: Identifying Special Tool(s)

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1. If equipped, remove the vent tube.
2. Remove the special tool.
   Fig 2: Removing Vent Tube

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3. Using the special tools, remove torque converter.
   Fig 3: Removing Torque Converter

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4. Using the special tool, mount the transmission to the bench.
   Fig 4: Mounting Transmission To Bench

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NOTE: If the transmission fluid pan gasket is not damaged, it can be reused.
Fig 5: Removing Transmission Fluid Pan
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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.
6. Clean the transmission fluid pan and pan magnet.
   Fig 6: Identifying Transmission Fluid Pan And Pan Magnet

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CAUTION: If installing a new filter, and the 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 the transmission is being repaired for a contamination-related failure, use a new filter and seal. The filter can be reused if no excessive contamination is present.
Fig 7: Removing Fluid Filter And Grommet
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7. Remove the fluid filter and grommet.
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.
Fig 8: Disconnecting Bulkhead Interconnector
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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.
9. Remove the speed sensors.
   1. Remove the output shaft speed (OSS) sensor bolt.
   2. Remove the OSS sensor.
   3. Remove the turbine shaft speed (TSS) sensor plug bolt.
   4. Remove the TSS sensor plug.
   Fig 9: Removing Speed Sensors

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CAUTION: Discard the manual lever shaft outer nut. Do not reuse.
Fig 10: Removing Outer Manual Control Lever
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10. Remove the outer manual control lever.
    1. Remove the manual lever shaft outer nut.
    2. Remove the outer manual control lever.
11. Remove the digital transmission range (TR) sensor.
    1. Remove the digital TR sensor bolts.
    2. Remove the digital TR sensor.
    Fig 11: Removing Digital TR Sensor

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12. Remove the manual control valve detent lever spring.
    1. Remove the manual control valve detent lever spring bolt.
    2. Remove the manual control valve detent lever spring.
    Fig 12: Removing Manual Control Valve Detent Lever Spring

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13. Remove the 24 main control valve body bolts and the main control valve body.
    Fig 13: Removing Control Valve Body Bolts

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14. Remove and discard the pump outlet screen.
    Fig 14: Removing Pump Outlet Screen

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NOTE: Use a shop cloth to protect the transmission case surface.
Fig 15: Removing Manual Lever Shaft Retaining Pin
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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

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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

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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
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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

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20. Remove the 2-3 accumulator spring retainer.
    Fig 20: Removing Accumulator Spring Retainer

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21. Remove the 2-3 accumulator piston.
    1. Remove the 2-3 accumulator spring.
    2. Remove the 2-3 accumulator piston.
    Fig 21: Removing Accumulator Piston

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22. Using the special tool, remove the reverse band servo retaining ring.
    Fig 22: Removing Reverse Band Servo Retaining Ring

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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 Spring

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CAUTION: If the tool is not available, extreme care must be taken. Spring pressure will force the overdrive servo piston assembly out of the case. Case bore damage may result from trying to pry on the internal retaining ring.
Fig 24: Removing Overdrive Servo Piston Retainer
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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 Return Spring

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26. Compress the 1-2 accumulator cover and remove the 1-2 accumulator piston retaining ring.
    Fig 26: Removing Accumulator Piston Retaining Ring

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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 Accumulator Upper Spring

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28. Using the special tools, remove the extension housing seal.
    Fig 28: Removing Extension Housing Seal

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NOTE: The 4X2 extension is shown, the 4X4 extension housing is similar.
NOTE: These bolts have been coated with a sealant. High break torque may be required to remove these bolts.
Fig 29: Removing Extension Housing And Extension Housing Gasket
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29. Remove the extension housing.
    1. Remove the four bolts and two nuts.
    2. Remove the extension housing and the extension housing gasket.
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 Return Spring

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31. Rotate the transmission to the vertical position with the output shaft toward the floor.
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: Placing Screwdriver On Flat Portion Of Connector
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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

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NOTE: These bolts have been coated with sealant. High break torque may be required to remove the bolts.
Fig 33: Removing Front Bolts
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34. Remove the front bolts.
35. Using the special tools, remove the front pump support.
    Fig 34: Removing Front Pump Support

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36. Remove and discard the pump gasket.
    • Remove the intermediate clutch piston return spring.
    • Remove the intermediate clutch piston return spring support.
37. If equipped, remove the intermediate clutch anti-rattle clip.
    Fig 35: Removing Intermediate Clutch Anti-Rattle Clip

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CAUTION: Remove the assembly carefully to prevent damage to the overdrive band friction material by the reverse clutch drive lugs.
Fig 36: Removing Forward Clutch Assembly
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38. Remove the following components as an assembly:
    • Intermediate clutch pack
    • Intermediate one-way clutch
    • Reverse clutch
    • Forward clutch assembly
39. Disengage and remove the overdrive band.
    Fig 37: Removing Overdrive Band

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40. Remove the forward clutch hub and the No. 3 forward clutch hub front bearing.
    Fig 38: Removing Forward Clutch Hub

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41. Remove the intermediate stub shaft.
    Fig 39: Removing Intermediate Stub Shaft

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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

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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

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44. Remove the center support retaining ring and note location for assembly.
    Fig 42: Removing Center Support Retaining Ring

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45. Remove the case-to-planet support spring.
    Fig 43: Removing Case-To-Planet Support Spring

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46. Remove the planetary gear support and planetary as an assembly.
    Fig 44: Removing Planetary Gear Support

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47. Remove the reverse clutch band.
    Fig 45: Removing Reverse Clutch Band

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48. Remove the retaining ring.
    Fig 46: Removing Retaining Ring

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49. Remove the direct clutch pack.
    Fig 47: Removing Direct Clutch Pack

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50. Remove the No. 8 bearing.
    Fig 48: Removing Bearing

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51. Remove the output shaft and output shaft ring gear assembly.
    Fig 49: Removing Output Shaft And Output Shaft Ring Gear Assembly

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52. Remove the No. 9 case rear bearing.
    Fig 50: Removing Rear Bearing

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53. Inspect and if necessary, using the special tools, remove the rear case bushing.
    Fig 51: Removing Rear Case Bushing

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