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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 459 (AUTOMATIC TRANSAXLE DIAGNOSIS, SERVICE & REPAIR - 4T65-E)REPAIR INSTRUCTIONSPRESSURE CONTROL SOLENOID (PCS) REPLACEMENTINSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the pressure control solenoid (322).
  2. Connect the transaxle wiring harness.
  3. Install the case side cover. Refer to CASE SIDE COVER REPLACEMENT  .
Fig 1: Installing Pressure Control Solenoid (PCS)
G01501998Courtesy of GENERAL MOTORS CORP.

Transmission Fluid Pressure (TFP) Manual Valve Position Switch Replacement



  1. Carefully install the fluid pressure manual valve position switch. Handle the switch carefully, the fluid pressure manual valve position switch is very delicate.
  2. Install the control valve body bolts (375, 379 and 381) that mount the fluid pressure manual valve position switch to the control valve body (300).

    Tighten 

    • Tighten the control valve body bolt (375) to 12 N.m (106 lb in).
    • Tighten the control valve body bolt (379) to 16 N.m(12 lb ft).
    • Tighten the control valve body bolt (381) to 8 N.m (70 lb in).
    Fig 1: Installing Transmission Fluid Pressure (TFP) Manual Valve Position Switch Replacement
    G01502001Courtesy of GENERAL MOTORS CORP.
  3. Connect the transaxle wiring harness.
  4. Install the case side cover. Refer to CASE SIDE COVER REPLACEMENT  .
RENDER: 1.0x

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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.