GM 20757530
Muffler & Pipe

The vehicle known as 2500 will have its Muffler replaced. First, lift and support the vehicle. Do not unaware the exhaust Muffler to right Catalytic Converter nuts and loosen the left Catalytic Converter. Apply a lubricant at the insulators where the Muffler assembly hangers are slid in to help separate. With the help of others, remove insulators from exhaust system hangers (4 and 5), and (6). Pull the Muffler assembly at the rear to free it from the catalytic converters, then move and rotate the Muffler towards the front of the vehicle to influence it. For installation, apply the lubricant onto the insulators once more to make it easier. With assistance, install the Muffler assembly by rotating it into its final position over the rear axle, moving it back and then forward to hook it up to the catalytic converters. Mount the insulators to exhaust system hangers (4, 5, and 6). Tigthen exhaust pipe clamp left side Catalytic Converter to 44 n.m (32 lb ft) and install exhaust Muffler to right Catalytic Converter nuts tighten to 45 n.m (33 lb ft). Finally, lower the vehicle.

One should begin Muffler (2500) replacement by properly raising and supporting the vehicle. Start by removing the exhaust Muffler right Catalytic Converter nuts before loosening the exhaust pipe clamp near the left Catalytic Converter. Apply lubrication to insulators at the spots where the Muffler assembly hangers fit in order to simplify removal. You will need help to take out the exhaust system hanger insulators numbered 4 through 6. Pull the Muffler assembly rearward to detach it from the catalytic converters before rotating the Muffler towards the vehicle's front to extract it. The installation process will benefit from additional lubrication of the insulators. You need help moving the Muffler assembly into position for installation over the rear axle. The system should travel backwards to reach the catalytic converters before sliding forward to connect. The insulators required installation onto exhaust system hangers numbered 4, 5, and 6. After installation of the exhaust pipe clamp which secures the left Catalytic Converter use 44 n.m (32 lb ft) torque then install Muffler nuts to the right Catalytic Converter while applying 45 n.m (33 lb ft) torque. Finally, lower the vehicle.

Lubricate the insulators again, position and install the muffler assembly, and reinstall the insulators (1-4).

Return the spare tire to its original position and lower the vehicle.

Install the right rear wheel speed sensor wiring harness clips to the frame and control arm bracket, connect the right rear wheel speed sensor wiring harness electrical connector clip to the frame, and reconnect any previously disconnected electrical connectors.

Remove the exhaust muffler to exhaust manifold pipe nuts and loosen the exhaust muffler clamp.

Lubricate the 3 insulators where the muffler assembly hangers are inserted to ease removal.