Caution: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury.

When removing exhaust components, an accumulation of dirt and corrosion can make work difficult. Use a penetrating oil on the threads of the U-bolts in order to assist in the removal of these components.

Notice: Replacement of exhaust system parts must be OEM standard to ensure that the vehicle operates as designed.

Important: 

•	When jacking or lifting the vehicle from the frame side rails, ensure the lift pads do not contact the catalytic converter or damage to the converter will result.

•	When servicing of the exhaust system requires removing and replacing the oxygen sensor, refer to Engine Controls.

•	Apply sealer GM P/N 9984226 or equivalent to all slip joint connections.

•	Replace the tailpipe whenever the muffler is replaced.

•	Always use new nuts when installing the exhaust pipe to the engine manifold. Clean the engine manifold stud threads with a wire brush before installing the new nuts.

1. Rattles and noise vibrations in the exhaust system are usually caused by the misalignment of parts. Inspect for proper alignment when installing a new exhaust pipe, or a muffler and a tailpipe.



2. When aligning the system, leave all of the bolts and the nuts loose until all of the parts are properly aligned.
3. Tighten the nuts and the bolts, working from the front to the rear.



4. Replace the following damaged components in order to maintain exhaust system alignment:

•	The exhaust system hangers

•	The hanger brackets

•	The clamps