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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 468 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSMUFFLER 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 muffler over the rear axle and towards the rear of the vehicle.
  2. Install the exhaust hanger insulators to the muffler.
  3. If the vehicle is equipped with AWD, use the utility stand to raise and install the crossmember.
    Fig 1: Installing Muffler Towards Rear Of Vehicle
    G01501637Courtesy of GENERAL MOTORS CORP.
  4. Install a new catalytic converter gasket.
  5. Install the catalytic converter bolts.

    Tighten 

    Tighten the bolts to 34 N.m (25 lb ft).

  6. Lower the vehicle.
    Fig 2: Installing Catalytic Converter Gasket And Bolts - Muffler Replacement
    G01501638Courtesy of GENERAL MOTORS CORP.
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.