DIFFERENTIAL SYSTEM


  1. OUTLINE


    1. A ring gear that is 230 mm in diameter is used to support the high-torque powertrain.

    2. A highly efficient radial ball bearing is used for the drive pinion shaft. In addition, the shape of the fluid path in the differential carrier is optimized to reduce the amount of fluid. As a result, torque loss is reduced, achieving improved fuel economy.

    3. The thickness of the differential carrier is reduced and a drive pinion with a hollow structure is used, achieving weight reduction.

    4. An FD23A type rear differential is used on all models. A pre-torque mechanism is used for the differential to improve the initial acceleration performance of the vehicle on slippery road surfaces.

    5. An FD23AT type rear differential with TORSEN* Limited Slip Differential (LSD) is used. By optimally distributing drive force in accordance with acceleration operation, a high level of traction performance, operability and driving stability have been achieved.

      Tech Tips

      TORSEN is a registered trade mark of JTEKT Corporation.

  2. SPECIFICATION


    1. Rear Differential

      Differential Type FD23A FD23AT
      Differential Gear Ratio 3.357 3.357
      Ring Gear Size 230 mm (9.1 in.) 230 mm (9.1 in.)
      Drive Pinion No. of Gear Teeth 14 14
      Ring Gear No. of Gear Teeth 47 47
      No. of Differential Pinion 2 10
      Oil Type Toyota Genuine Differential Gear Oil LT Toyota Genuine Differential Gear Oil LX
      Oil Viscosity SAE 75W-85 SAE 75W-85
      Oil Grade API GL-5 API GL-5

  3. MAIN FEATURES


    1. TORSEN LSD


      1. The TORSEN LSD responds well to changes in the road surface when driving straight, thus ensuring straight-line stability.

        A004CIYE03

      2. The TORSEN LSD reacts to limit the torque difference between the left and right wheels, thus distributing the coast torque generated by engine braking from the inner wheel to the outer wheel when decelerating during turning. As a result, a yaw moment opposite to the direction of the turn is generated, thus ensuring vehicle stability.

        A004CNNE02
        *1 Coast Torque
        *2 Torque Distribution
        *3 Yaw Moment

      3. The TORSEN LSD reduces drive torque sent to the inner wheel and distributes it to the outer wheel when the inner wheel is slipping during acceleration while turning. As a result, a yaw moment in the turning direction is generated, thus achieving a high level of traction performance and operability.

        A004CPWE02
        *1 Drive Torque
        *2 Torque Distribution
        *3 Yaw Moment

  4. PRECAUTION


    1. TORSEN LSD


      1. Do not add drive torque with only one of the rear wheels on the ground or with one of the rear wheels spinning. The structure of the TORSEN LSD transmits drive torque to the stopped wheel, which may cause the vehicle to move suddenly without any warning. Also, the differential mechanism may suffer damage in the above situation, possibly leading to a malfunction.

      2. For the left and right rear wheels, equip tires of the same type and size which have roughly similar amounts of wear.