LS400 1990-1997

Transmission Removal & Installation

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  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable. Wait at least 90 seconds before performing any other work.
     
    Transmission dipstick and tube
     
    Throttle cable
     
    Driveshaft
     
    Engine undercover
     
    Shift control rod
     
    Exhaust pipe support bracket by removing the 2 bolts
     
    Catalytic converters by removing the 6 nuts
     
    Both side heat insulators
     
    Oil cooler tube clamps and disconnect the tubes
     
    Torque converter inspection plate by removing the 2 bolts.
     
    Torque converter bolts

    Click image to see an enlarged view

    Fig. Exploded view of the transmission mounting-LS400

     

  4.  
  5. Support the transmission with a suitable jack.
  6.  
  7. Remove or disconnect the following:

    Rear transmission mount
     
    Overdrive direct clutch speed sensor connector
     
    Vehicle Speed Sensor (VSS) connector
     
    Park/Neutral Position (PNP) switch connector
     
    Solenoid connector
     
    3 wiring harness clamps from the bracket on the transmission.
     
    10 transmission mounting bolts and the transmission.
     

  8.  

To install:

  1. Install or connect the following:

    Transmission and tighten the bolts as follows: 14mm-27 ft. lbs. (37 Nm); 17mm-53 ft. lbs. (72 Nm)
     
    3 wiring harness clamp to the bracket on the transmission.
     
    Solenoid connector
     
    PNP switch connector
     
    VSS connector
     
    Overdrive direct clutch speed sensor connector
     
    Rear transmission mount and tighten the bolts to 19 ft. lbs. (20 Nm) and the nuts to 10 ft. lbs. (13 Nm).
     
    And tighten the torque converter bolts to 30 ft. lbs. (41 Nm).
     
    Converter inspection plate
     
    Support from the transmission
     
    Oil cooler pipes and tighten the union nuts to 32 ft. lbs. (44 Nm).
     
    Side heat insulators
     
    Catalytic converters with new gaskets and new nuts. Tighten the nuts to 46 ft. lbs. (62 Nm).
     
    Exhaust pipe support bracket with the 2 bolts and tighten the bolts to 32 ft. lbs. (44 Nm).
     
    Shift control rod
     
    Engine undercover
     
    Driveshaft
     
    Throttle control cable
     
    Transmission tube and dipstick
     
    Negative battery cable
     

  2.  
  3. Fill the transmission to the proper level with Dexron®II, or equivalent.
  4.  

 
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