GM Astro/Safari 1985-1996 Repair Guide

Speedometer Cable

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REMOVAL & INSTALLATION



Mechanical Speedometer

See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Mechanical speedometer cable routing

  1. Refer to the Instrument Cluster, Removal and Installation procedures in this section and remove the instrument cluster.
  2.  
  3. From the rear of the instrument cluster, remove the speedometer cable-to-head fitting.
  4.  
  5. If replacing ONLY the speedometer cable core, perform the following procedures:
    1. Disconnect the speedometer casing from the speedometer head.
    2.  
    3. Pull the speedometer cable core from the speedometer casing.
    4.  
    5. Using lubricant P/N 6478535 or equivalent, lubricate a new speedometer cable core and install the cable into the casing.
    6.  

  6.  
  7. If replacing the speedometer cable core and the speedometer cable casing, perform the following procedures:
    1. Disconnect the speedometer cable casing from the speedometer head.
    2.  
    3. Disconnect the speedometer cable casing from the transmission.
    4.  
    5. Remove the various speedometer cable/casing retaining clips.
    6.  
    7. Remove the speedometer cable/casing assembly from the vehicle.
    8.  

  8.  

Electronic Speedometer

See Figure 2



Click image to see an enlarged view

Fig. Fig. 2: Typical electronic speedometer speed sensor mounted in the transmission or the transfer case

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle with jackstands.
  4.  
  5. Disconnect the harness connector at the transmission.
  6.  
  7. Remove the retaining bolt and sensor.
  8.  
  9. Drain the excess fluid into a drain pan.
  10.  
  11. Replace the O-ring seal if damaged.
  12.  

To install:
  1. Install the sensor with a new O-ring. Coat the seal with a film of transmission fluid.
  2.  
  3. Install the bolt and torque to 96 inch lbs. (11 Nm).
  4.  
  5. Connect the harness connector and negative battery cable.
  6.  
  7. Start the engine and allow it to reach normal operating temperature.
  8.  
  9. Refill the transmission with fluid to the proper level and check operation.
  10.  

 
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