2008 Lexus IS 350FACTORY OEM SERVICE PROCEDURE

Automatic Transmission Unit: Disassembly

CAUTION: When working with FIPG material, perform the following:
  • Using a razor blade and gasket scraper, remove all the old FIPG material from the gasket surfaces.
  • Thoroughly clean all components to remove any loose material.
  • Clean both sealing surfaces with a non-residue solvent.
  • Apply FIPG in a continuous line (width approximately 1 mm (0.04 in.)) along the sealing surface.
  • Parts must be assembled within 10 minutes of application. Otherwise, the FIPG material must be removed and reapplied.
  1. REMOVE TRANSMISSION CASE COVER 
    1. Remove the 2 bolts and transmission case cover.
      Fig 1: Locating Transmission Case Cover Bolts
      G05824277Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. REMOVE TRANSMISSION CONTROL SHAFT LEVER RH 
    1. Remove the nut, spring washer and the transmission control shaft lever RH.
      Fig 2: Identifying Nut, Spring Washer And Transmission Control Shaft Lever
      G05824278Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REMOVE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Using a screwdriver, unstake the lock washer.
    2. Remove the nut and lock washer.
    3. Remove the bolt and park/neutral position switch.
      Fig 3: Locating Park/Neutral Position Switch Bolt
      G05824279Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. REMOVE TRANSMISSION OIL COOLER 
    1. Remove the 3 bolts, transmission oil cooler, and spacer.
      Fig 4: Identifying Bolts, Transmission Oil Cooler And Spacer
      G05824280Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 2 O-rings from the transmission oil cooler.
    3. Remove the 2 O-rings from the spacer.
      Fig 5: Identifying Spacer O-Rings
      G05824281Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE TRANSMISSION REVOLUTION SENSOR 
    1. Remove the 2 bolts and the 2 transmission revolution sensors.
    2. Remove the O-ring from each sensor.
      Fig 6: Identifying Transmission Revolution Sensors Bolts And O-Ring
      G05824282Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE AUTOMATIC TRANSMISSION BREATHER TUBE 
    1. Remove the 2 bolts.
    2. Remove the breather tube.
      Fig 7: Locating Breather Tube Bolts
      G05824283Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE AUTOMATIC TRANSMISSION HOUSING 
    1. Remove the 10 bolts.
    2. Remove the transmission housing.
      Fig 8: Locating Transmission Housing Bolts
      G05824284Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE AUTOMATIC TRANSMISSION FLANGE YOKE ASSEMBLY 
    1. Using a hammer and chisel, loosen the staked part of the nut.
    2. Remove the nut and flange yoke.
      Fig 9: Loosening Staked Part Of Nut
      G05824285Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the oil seal from the flange yoke.
      Fig 10: Identifying Oil Seal
      G05824286Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. REMOVE EXTENSION (ATM) HOUSING SUB-ASSEMBLY 
    1. Remove the 6 bolts.
      Fig 11: Locating Extension Housing Bolts
      G05824287Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using a screwdriver, remove the extension housing sub-assembly.
      Fig 12: Removing Extension Housing Sub-Assembly
      G05824288Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using a snap ring expander, remove the snap ring.
    4. Remove the thrust needle roller bearing and the 2 bearing races.
      Fig 13: Removing Snap Ring
      G05824289Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. REMOVE REAR COVER SLEEVE 
    1. Remove the 2 washers and rear cover sleeve.
      Fig 14: Identifying Washers And Rear Cover Sleeve
      G05824290Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. REMOVE TRANSMISSION CASE ADAPTOR RADIAL BALL BEARING 
    1. Remove the transmission case adaptor radial ball bearing from the extension housing sub-assembly.
      Fig 15: Identifying Transmission Case Adaptor Radial Ball Bearing
      G05824291Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. REMOVE AUTOMATIC TRANSMISSION EXTENSION HOUSING OIL SEAL 
    1. Using a screwdriver, remove the oil seal.
      Fig 16: Removing Oil Seal
      G05824292Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. FIX AUTOMATIC TRANSMISSION CASE SUB-ASSEMBLY 
    1. Install the transmission case on the overhaul attachment.
  14. 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.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.