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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 39 (AUTOMATIC TRANSAXLE OVERHAUL & TESTING - 4T65-E)TRANSAXLE DISASSEMBLYCONTROL VALVE BODY, OIL PUMP & VEHICLE SPEED SENSOR
1999 GMC Forward Control 5.7 R, Automatic

Control Valve Body, Oil Pump & Vehicle Speed Sensor

1999 GMC Forward Control 5.7 R, AutomaticSECTION Control Valve Body, Oil Pump & Vehicle Speed Sensor
WARNING: This page does not describe the selected car, but rather 43 other vehicles, including the 2003 Pontiac Montana, 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Pontiac Aztek, and 2003 Oldsmobile Silhouette. However, it is still accessible from the selected car via links, so may be relevant.
  1. Position transaxle with control valve body cover facing up. Remove case side cover (control valve body cover) bolts. See Fig 1. Remove cover and gaskets. See Figure. Using small screwdriver, pry wiring harness electrical connectors off transaxle fluid pressure manual valve position switch, 1-2 and 3-4 shift solenoid, 2-3 shift solenoid, TCC PWM solenoid, pressure control solenoid and input speed sensor. Gently pull transaxle fluid temperature sensor from clip. See Fig 2 and Fig 3 .
  2. Lift wiring harness assembly off transaxle. Remove oil pump assembly bolts. DO NOT remove No. 1 oil pump cover bolt at this time. See Fig 4. Remove wiring harness clip. Lift oil pump assembly off control valve body. See Fig 5. Set oil pump assembly on its cover.
  3. Remove control valve body bolts. See Fig 6. Manual valve position switch is very delicate, use care when handling. Carefully lift manual valve position switch off control valve body. See Fig 7. Remove control valve body. See Fig 8. Remove 4 check balls from case cover. See Fig 9. Remove 2 bolts retaining spacer plate and gaskets to valve body. Remove spacer plate with 2 screen/seal assemblies and gaskets from valve body. Remove 6 check balls from valve body. See Fig 10. Remove case cover pin.
  4. Remove oil pump drive shaft from case cover. See Fig 11. Position transaxle so Vehicle Speed Sensor (VSS) is facing up. Remove VSS bolt and VSS. See Figure.
Fig 1: Identifying Case Side Cover Bolt Locations
G00057584Courtesy of GENERAL MOTORS CORP.
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.