2008 Lexus GS 460FACTORY OEM SERVICE PROCEDURE

Automatic Transmission Unit: Disassembly

  1. REMOVE HARNESS BRACKET 
    1. Remove the 2 bolts and harness brackets.
      Fig 1: Locating Harness Brackets Bolts
      G05751014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. REMOVE TRANSMISSION CONTROL SHAFT LEVER RH 
    1. Remove the nut, spring washer and transmission control shaft lever RH.
      Fig 2: Identifying Transmission Control Shaft Lever Nut
      G05751015Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REMOVE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Using a screwdriver, bend the tabs of the lock washer.
    2. Remove the nut and lock washer.
    3. Remove the bolt and park/neutral position switch assembly.
      Fig 3: Identifying Park/Neutral Position Switch, Bolts Nut And Lock Washer
      G05751016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. REMOVE OIL COOLER TUBE UNION 
    1. Remove the 2 oil cooler tube unions.
    2. Remove the 2 O-rings from the 2 oil cooler tube unions.
      Fig 4: Removing Oil Cooler Tube Unions
      G05751017Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE NO. 1 BREATHER PLUG 
    1. Remove the No. 1 breather plug.
      Fig 5: Locating No. 1 Breather Plug
      G04948617Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE AUTOMATIC TRANSMISSION FLANGE YOKE ASSEMBLY 
    1. Using SST and a hammer, loosen the staked part of the nut.

      SST 09930-00010 

      Fig 6: Loosening Staked Part Of Nut
      G04948618Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using SST and a 30 mm socket wrench, remove the nut.

      SST 09330-00021, 09950-30012 (09955-03040) 

    3. Remove SST.
    4. Tap the flange yoke with a plastic-faced hammer to remove it.
    5. Remove the 2 rear No. 1 output shaft bearing spacers and rear cover sleeve.
      Fig 7: Removing Nut
      G05751020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using a screwdriver, pry out the oil seal from the flange yoke.
  7. REMOVE AUTOMATIC TRANSMISSION OIL PAN SUB-ASSEMBLY 
    NOTE: Do not turn the transmission over as this will contaminate the valve body with foreign matter located at the bottom of the pan.
    1. Remove the overflow plug and gasket.
    2. Remove the drain plug and gasket.
      Fig 8: Identifying Flange Yoke O-Ring
      G04948620Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the 9 bolts, oil pan and gasket.
      Fig 9: Locating Automatic Transmission Oil Pan Bolts
      G04948406Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Examine the particles in the pan.
      1. Remove the magnets from the oil pan. Use the removed magnets to collect any steel chips. Look carefully at the chips and particles in the pan and on the magnet to anticipate the type of wear which might be found in the transmission. Steel (magnetic): bearing, gear and plate wear Brass (non-magnetic): bush wear
        Fig 10: Removing Particles In Pan
        G04831117Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE VALVE BODY OIL STRAINER ASSEMBLY 
    1. Remove the 4 bolts and valve body oil strainer from the valve body.
      Fig 11: Locating Oil Strainer Bolts
      G04948408Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the O-ring from the valve body oil strainer.
      Fig 12: Identifying Oil Strainer O-Ring
      G04948409Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. REMOVE TRANSMISSION VALVE BODY ASSEMBLY 
    1. Remove the bolt, lock plate and ATF temperature sensor.
    2. Remove the O-ring from the ATF temperature sensor.
    3. Disconnect the 8 connectors from the solenoid valves.
      Fig 13: Locating Solenoid Valves Connector
      G04948410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the bolt, detent spring cover and detent spring.
      Fig 14: Identifying Detent Spring Cover And Detent Spring
      G04948411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the 17 bolts.
    6. Remove the valve body.
      Fig 15: Locating Valve Body Bolts
      G04948412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Disconnect the manual valve connecting rod from the manual valve lever sub-assembly.
      Fig 16: Identifying Connecting Rod And Manual Valve Lever
      G05751029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. REMOVE CHECK BALL BODY 
    1. Remove the check ball body and spring.
      Fig 17: Identifying Check Ball Body And Spring
      G04948413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. REMOVE TRANSMISSION WIRE 
    1. Disconnect the 3 connectors from the 3 speed sensors.
    2. Remove the O-ring from the speed sensor NT.
      Fig 18: Locating Speed Sensor Connectors
      G04948439Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the bolt and pull out the transmission wire.
    4. Remove the O-ring from the transmission wire connector.
      Fig 19: Locating Transmission Wire Connector Bolt
      G04948441Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. REMOVE SPEED SENSOR 
    1. Remove the 2 bolts and 2 speed sensors NC3 and SP2.
    2. Using a T30 "TORX" wrench, remove the bolt and speed sensor NT.
      Fig 20: Locating Speed Sensor Bolts
      G04948631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. REMOVE AUTOMATIC TRANSMISSION CASE PLUG 
    1. Remove the plug and O-ring.
      Fig 21: Locating Automatic Transmission Case Plug And O-Ring
      G04948632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. REMOVE PARKING LOCK PAWL BRACKET 
    1. Remove the 3 bolts and parking lock pawl bracket.
      Fig 22: Locating Parking Lock Pawl Bracket Bolts
      G04948633Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. REMOVE PARKING LOCK ROD SUB-ASSEMBLY 
    1. Disconnect the parking lock rod from the manual valve lever.
      Fig 23: Removing Parking Lock Rod
      G04948634Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. REMOVE PARKING LOCK PAWL SHAFT 
    1. Pull out the parking lock pawl shaft from the front side, then remove the lock pawl and spring.
    2. Remove the E-ring from the shaft.
      Fig 24: Identifying Parking Lock Pawl Shaft
      G04948635Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  17. REMOVE MANUAL VALVE LEVER SUB-ASSEMBLY 
    1. Using a screwdriver and hammer, cut off the spacer and remove it from the shaft.
      Fig 25: Cutting Off Spacer
      G04948636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using a pin punch and hammer, tap out the spring pin.

      HINT:

      Slowly tap out the spring pin so that it will not fall into the transmission case.

    3. Pull the manual valve lever shaft out through the case, and remove the manual valve lever sub-assembly.
      Fig 26: Tapping Out Spring Pin
      G04948637Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  18. REMOVE MANUAL VALVE LEVER SHAFT OIL SEAL 
    1. Using a screwdriver, pry out the oil seal.
      Fig 27: Prying Out Oil Seal
      G04948638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  19. REMOVE OIL PUMP ASSEMBLY 
    1. Remove the 11 bolts from the transmission case.
      Fig 28: Locating Transmission Case Bolts
      G04948639Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Pull out the oil pump.
      NOTE: Do not damage the oil pump.
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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.