2008 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

Automatic Transmission Unit: Disassembly

  1. REMOVE TRANSMISSION CONTROL SHAFT LEVER LH 
    1. Remove the nut, washer and control shaft lever LH.
      Fig 1: Locating Control Shaft Lever LH And Bolt
      G05191363Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. REMOVE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Using a screwdriver, pry out the lock washer.
    2. Remove the nut, lock washer and bolt.
    3. Remove the park/neutral position switch.
      Fig 2: Identifying Park/Neutral Position Switch Assembly
      G04963492Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REMOVE OIL COOLER TUBE UNION 
    1. Remove the 2 oil cooler tube unions.
    2. Remove the O-ring from the oil cooler tube union.
      Fig 3: Identifying Oil Cooler Tube Unions
      G04963493Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. REMOVE SPEED SENSOR 
    1. Remove the 2 bolts and 2 speed sensor.
    2. Remove the O-ring from each sensor.
      Fig 4: Locating Speed Sensor Bolts
      G04963494Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE AUTOMATIC TRANSAXLE BREATHER TUBE 
    1. Remove the 2 bolts.
    2. Remove the breather tube.
    3. Remove the O-ring from each tube.
      Fig 5: Locating Automatic Transaxle Breather Tube
      G04965229Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE AUTOMATIC TRANSMISSION HOUSING 
    1. Remove the 10 bolts.
    2. Remove the transmission housing.
  7. REMOVE TRANSMISSION CASE ADAPTER SUB-ASSEMBLY 
    1. Remove the 8 bolts.
    2. Remove the transmission case adapter assembly.

      HINT:

      Use a brass bar and a hammer to remove the extension housing assembly.

      Fig 6: Locating Transmission Housing Bolts
      G04963496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the gasket from the transmission case adapter sub-assembly.
      Fig 7: Identifying Transmission Case Adapter Sub-Assembly
      G05191368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE TRANSMISSION CASE ADAPTER OIL SEAL 
    1. Using a screwdriver, pry out the oil seal.
      Fig 8: Prying Oil Seal
      G05191369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. FIX AUTOMATIC TRANSMISSION CASE SUB-ASSEMBLY 
    1. Install the transmission case on the overhaul attachment.
  10. REMOVE AUTOMATIC TRANSMISSION OIL PAN SUB-ASSEMBLY 
    NOTE: Do not turn the transmission over as this will contaminate the valve body with foreign matter on the bottom of the pan.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.