GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Exhaust 🢒 Exhaust Muffler Replacement

Removal Procedure

    Object Number: 376937 Size: SH
  1. Remove the mounting straps from around the muffler.
  2. Remove the nuts from the catalytic converter studs.
  3. Disconnect the exhaust pipes from the exhaust manifolds.
  4. Remove the muffler.
  5. Inspect the components for the following conditions:
    6. • Cracks
    • Bends
    • Stripped threads
    • Corrosion damage
    • Leaks
  6. Repair or replace any damaged components as necessary.

Installation Procedure

    Object Number: 376937 Size: SH

    Important: Use a new tail pipe (if equipped) whenever you replace a horizontal muffler.

  1. Slide the mounting straps over the muffler.

    2. Object Number: 206339 Size: SH
  2. Install the exhaust clamps around the muffler.
  3. Connect the exhaust pipes to the exhaust manifolds.
  4. Install the nuts to the catalytic converter studs.

    5. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  5. Tighten the fasteners.

    6. Tighten

        • Tighten the exhaust hanger nuts to 29 N·m (21 lb ft).
        • Tighten the exhaust pipe to the muffler nuts to 24 N·m (18 lb ft).
        • Tighten the muffler clamp nuts to 50 N·m (37 lb ft).
        • Tighten the wide band clamps to 73 N·m (54 lb ft).