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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 761 (AUTOMATIC TRANSMISSION - 4L60-E/4L65-E (INTRODUCTION, SERVICE & REPLACEMENT))REPAIR INSTRUCTIONSCONTROL AND SHIFT SOLENOIDS REPLACEMENTREMOVAL PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Valve Body Electrical Connections
    GM181573Courtesy of GENERAL MOTORS CORP.
  1. Remove the transmission oil pan and filter. Refer to Automatic Transmission Fluid/Filter Replacement .
    2. IMPORTANT: Do not remove the valve body for the following procedures. Removal of the 1-2 accumulator is necessary only if servicing the pressure control solenoid.
  2. Remove the 1-2 accumulator if necessary. Refer to Accumulator Assembly, Spacer Plate, and Gaskets .
  3. Disconnect the internal wiring harness electrical connectors from the following components:
    • Transmission fluid pressure switch (1)
    • 1-2 shift control solenoid (2)
    • 2-3 shift control solenoid (3)
    • Pressure control solenoid (4)
    • TCC PWM solenoid (5)
    • 3-2 control solenoid (6)
    4. Fig 2: Locating Pressure Control Solenoid & Retainer
    GM298162Courtesy of GENERAL MOTORS CORP.
  4. Remove the pressure control solenoid retainer.
  5. Remove the pressure control solenoid.
    6. Fig 3: View Of 1-2 & 2-3 Shift Solenoids & Retainers
    GM298169Courtesy of GENERAL MOTORS CORP.
  6. Remove the 1-2 and 2-3 shift solenoid retainers.
  7. Remove the 1-2 and 2-3 shift solenoids.
    8. Fig 4: View Of 3-2 Control Solenoid & Retainer
    GM298167Courtesy of GENERAL MOTORS CORP.
  8. Remove the 3-2 control solenoid retainer.
  9. Remove the 3-2 control solenoid.
RENDER: 1.0x

NO RELATED

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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.