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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 973 (Automatic Transmission - ALLISON (Introduction, Service & Replacement)) >> Repair Instructions >> Control Valve Solenoid Replacement (Solenoid A, B) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement .
    IMPORTANT: The modulated main pressure solenoid G is removed for clarity.
  2. Disconnect the internal wiring harness from the solenoid being changed.
  3. Remove the 2 bolts (2) that fasten reverse signal pipe (1) to the control valve assembly. Remove the reverse signal pipe.
    Fig 1: Removing The Reverse Signal Pipe
    GM658988Courtesy of GENERAL MOTORS CORP.
  4. To remove pressure control solenoid A (1) or pressure control solenoid B (8), remove three bolts (4) and the pressure control valve retaining bracket (5). Remove accumulators (3) and springs (6) if they do not fall out when bracket (5) is removed.
    IMPORTANT:
    • When the pressure control valve retaining bracket (5) is removed, there are 2 sets of accumulators (3) and springs (6) which may fall from the bores. Be sure to catch the accumulators and springs so as to prevent damage to these parts.
    • The pressure control valve retaining bracket (5) must not be modified. Note that the angle between the 2 bracket surfaces is less than 90 degrees. Replace the bracket if the angle is 90 degrees or more.
    Fig 2: Locating Control Valve Solenoids
    GM658989Courtesy of GENERAL MOTORS CORP.
  5. Note the position of the solenoid connector and pull the solenoid (1) or (8) out of the bore in the control valve assembly. The O-ring on the solenoid provides the resistance felt during removal.
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