Before replacing the Muffler, make sure goggles and gloves are worn, and keep in mind exhaust service precautions. The Muffler is serviced as a unit with an
Exhaust Pipe and a Tail Pipe and if the aftermarket Tail Pipe is involved it may modify the process. Increase the height of the vehicle by the frame to decrease the rear axle. Remove the nuts holding the
Catalytic Converter pipe off of the Muffler flange from a vehicle equipped with a single Catalytic Converter pipe that has a 4.3 l engine. For a 4.8/5.3/6.0l engine with dual Catalytic Converter pipes, loosen the clamp for the right Catalytic Converter pipes and remove the nuts that hold the left Catalytic Converter to the Muffler flange. While the wheelbase of the vehicle, and size and length of the vehicle's exhaust system, disconnect the Muffler assembly hanger pins from exhaust hanger insulators. It is also may require at least two personnel because of the weight of the exhaust system. Pull the Muffler assembly over the rear axle and remove it towards the front end of the car. In the case of installation, raise the Muffler assembly above the rear axle, from the front of the vehicle, and possibly with use; two individuals can raise it, install the hanger pins of the exhaust hanger insulators. If optional 4.3l engine, install the retaining nuts and new gasket to the front of Muffler and tightening the Catalytic Converter to Muffler retaining nuts, 48 nm (35 ft. Lbs). For 4.8/4.3l/6.0l engine, put right Catalytic Converter in Muffler and tighten the clamp nut to 54 nm (40 ft lbs). Replace the new gasket and the nuts screwing the left Catalytic Converter to the Muffler flage, make sure the exhaust system is aligning correctly and tighten the right Catalytic Converter clamp to 54nm (40ft. Lbs.) and the Catalytic Converter to Muffler flage nuts to 48 n (35ft. Lbs.). Finally, lower the vehicle.