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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 INSTRUCTIONSOIL COOLER LINE REPLACEMENT (REAR)INSTALLATION 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 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: TOC Rear Pipe Front, Rear Clamp & Bolts
    GM71416Courtesy of GENERAL MOTORS CORP.
  1. Install the transmission oil cooler (TOC) rear pipes into position.
    2. NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Install the TOC rear pipe front and rear retaining clamps and bolts.

    Tighten:  Tighten the transmission oil cooler rear pipe front and rear retaining clamp bolts to 12 N.m (106 lb in).

  3. Install the TOC rear pipe middle clip.
    4. Fig 2: TOC Rear Pipe & Rear Clip
    GM71415Courtesy of GENERAL MOTORS CORP.
  4. Install the TOC rear pipe rear clip.
    5. Fig 3: TOC Rear Upper & Lower Pipe Fittings
    GM71414Courtesy of GENERAL MOTORS CORP.
  5. Remove the caps from the rear of the TOC rear pipes and remove the plugs from the transmission fittings.
  6. ALIGN and HAND-START, then tighten ONLY by hand to seat the TOC rear upper and lower pipe fittings to the transmission fittings.

    Tighten:  Tighten the transmission oil cooler rear upper and lower pipe fittings to the transmission fittings to 35 N.m (26 lb ft).

    7. Fig 4: Locating Cooler Fittings
    GM71418Courtesy of GENERAL MOTORS CORP.
  7. ALIGN and HAND-START, then tighten ONLY by hand to seat the TOC rear upper and lower pipe fittings to the junction fittings at the engine flywheel housing.

    Tighten:  Tighten the transmission oil cooler rear upper and lower pipe fittings to the junction fittings at the engine flywheel housing to 27 N.m (20 lb ft).

  8. Install the driveline tunnel closeout panel. Refer to Driveline Tunnel Closeout Panel Replacement in Propeller Shaft.
  9. Install the right side muffler. Refer to Muffler Replacement - Right in Engine Exhaust.
  10. Install the catalytic converter. Refer to Catalytic Converter Replacement in Engine Exhaust.
  11. Check the transmission fluid level. Add if necessary.
  12. Lower the vehicle.
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.