2007 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Automatic Transmission Unit: Reassembly

  1. BEARING POSITION 
    Fig 1: Identifying Bearing Position
    G05289945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    THRUST BEARING DIAMETER AND BEARING RACE DIAMETER SPECIFICATION

    Mark Front Race Diameter Inside/Outside Thrust Bearing Diameter Inside/Outside Rear Race Diameter Inside/Outside
    A 74.2 mm (2.921 in.) / 87.74 mm (3.454 in.) 71.9 mm (2.831 in.) / 85.6 mm (3.370 in.) -
    B 38.0 mm (1.496 in.) / 57.0 mm (2.244 in.) 43.4 mm (1.709 in.) / 58.3 mm (2.295 in.) -
    C - 55.7 mm (2.193 in.) / 76.4 mm (3.008 in.) -
    D - - 53.7 mm (2.114 in.) /74.0 mm (2.913 in.)
    E 33.4 mm (1.315 in.) / 49.0 mm (1.929 in.) 32.1 mm (1.264 in.) / 49.35 mm (1.943 in.) 32.1 mm (1.264 in.) / 49.0 mm (1.929 in.)
    F - 21.5 mm (0.847 in.) / 40.8 mm (1.606 in.) -
    G - 43.6 mm (1.717 in.) / 61.0 mm (2.402 in.) 47.1 mm (1.854 in.) / 67.1 mm (2.642 in.)
    H 37 mm (1.45 in.) / 52.3 mm (2.059 in.) 34.6 mm (1.362 in.) / 52.0 mm (2.047 in.) -
    I 36.9 mm (1.453 in.) / 49.7 mm (1.957 in.) 36.1 mm (1.421 in.) / 52.5 mm (2.067 in.) 36.1 mm (1.421 in.) / 51.0 mm (2.007 in.)
  2. INSTALL BRAKE PISTON NO.4 
    1. Coat 2 new O-rings with ATF, and install them to the brake reaction sleeve.
    2. Coat 2 new O-rings with the ATF, and install them to the brake piston No.4.
    3. Install the brake piston No.4 to the reaction sleeve.
      NOTE: Be careful not to damage the O-rings.
    Fig 2: Identifying O Rings
    G05294967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSTALL BRAKE REACTION SLEEVE 
    1. Coat a new O-ring with ATF, and install it to the reaction sleeve.
    2. With the brake piston No.4 underneath (the rear side), install the brake reaction sleeve and the brake piston No.4 to the transmission case.
      NOTE: Be careful not to damage the O-rings.
    Fig 3: Identifying Brake Reaction Sleeve
    G05294968Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSTALL 1ST AND REVERSE BRAKE PISTON 
    1. Coat a new O-ring with ATF.
    2. Install the O-ring on the 1st and reverse brake piston.
    3. With the spring seat of the piston facing upwards (the front side), place the piston in the transmission case.
      NOTE: Be careful not to damage the O-ring.
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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.

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