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 MOUNTING BRACKET REPLACEMENTREMOVAL PROCEDURE

1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal 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.

Raise and support the vehicle. Refer to LIFTING & JACKING THE VEHICLE .
NOTE: To prevent internal damage to the flexible coupling of the catalytic converter assembly, the converter must be supported. The vertical movement at the rear of the catalytic converter assembly must not exceed 6 degrees up or down.
Support the exhaust system.
Remove the exhaust pipe rear hanger insulator from the exhaust pipe rear hanger bracket.
Remove the exhaust pipe rear hanger screw.
Remove the exhaust pipe rear hanger bracket.

Fig 1: Exhaust Pipe Hanger Insulator, Bracket & Screw
Courtesy of GENERAL MOTORS CORP.
Remove the exhaust pipe rear hanger insulators from the exhaust muffler rear hanger bracket.
Loosen the outboard rear bumper impact bar bolt.
Remove the inboard rear bumper impact bar bolt.
Remove the exhaust muffler rear hanger bracket.

Fig 2: Exhaust Pipe Rear Hanger Insulator & Bracket
Courtesy 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.