Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 717 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST HANGER 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 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

Install the exhaust pipe rear hanger insulators to the muffler and the rear hanger brackets.

Fig 1: Exhaust Pipe Rear Hanger Insulators & Brackets
Courtesy of GENERAL MOTORS CORP.
Install the exhaust pipe hanger insulator to the exhaust pipe and the hanger bracket.

Fig 2: Exhaust Pipe Hanger Insulator
Courtesy of GENERAL MOTORS CORP.
Remove the support from the exhaust system.
Inspect the exhaust system for underbody contact.
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.