OEM GMC Muffler

GMC Muffler Parts Questions & Experts Answers

• Muffler W/Tpipe
  84590712
  Q: How to replace the muffler (NB5) on GMC Acadia?

  A: In order to change the Muffler (NB5) first, lift up the vehicle and support it. Take out exhaust flexible pipe to Muffler nuts , and with the aid of an assistant, remove the rubber insulators from the exhaust underbody hangers. Help and take off the Muffler assembly from exhaust flexible pipe and the vehicle. For installation, with an assistant's help, mount the Muffler assembly onto the vehicle and attach it to the exhaust flexible pipe. Following this, fit the rubber insulators to the exhaust underbody hangers. Make sure to loosen the exhaust flexible pipe to Muffler nuts a 50 n.m (37 lb ft). Finally, lower the vehicle.
• Muffler
  15798961
  Q: How to replace the muffler on a 1500 Series equipped with a 4.3L, 4.8L, 5.3L, or 6.0L engine on GMC Sierra 1500?

  A: Installation of the new Muffler on 1500 series vehicles starts by supporting the vehicle and lowering the spare tire when replacing engines using 4.3l, 4.8l, 5.3l, and 6.0l as power units. Start by removing the exhaust Muffler nuts which secure the Catalytic Converter. A 4.8l engine requires lubrication on the 3 insulator points entering the Muffler assembly hangers before their removal. With help, personnel can detach the insulators (1, 2) from the front and rear hanger points. Take out the intermediate Muffler assembly by first removing its insulator followed by pulling the assembly backward until the front frame crossmember flange clears. The procedure for insulators (1, 2) lubrication and removal must be repeated exactly as described for vehicles using 5.3l or 6.0l engines. Both flex couple installation and removal require careful handling to avoid damage to internal structures. To install the Muffler assembly with a 4.8l engine system you must perform a new lubrication of the 3 insulators before properly positioning the assembly then assisted installation of the insulators (1, 2) on the front and rear Muffler hangers followed by the insulator installation to the intermediate hanger. The installation procedure should be redone for vehicles equipped with 5.3l or 6.0l engines. Next proceed with installing the Catalytic Converter by attaching exhaust Muffler nuts while torquing to 45 n.m (33 lb ft). Once complete replace the spare tire and lift the vehicle down.
• Muffler & Pipe
  20882403
  Q: How to replace the exhaust muffler on those equipped with L92 on GMC Yukon?

  A: You should gather hose clamp pliers (J 38185) as your first step to replace the exhaust Muffler on l92 vehicles. Hose clamp pliers (J 38185). First detach the right rear wheel together with its tire followed by disconnecting the wiring harness electrical connector from the right rear wheel speed sensor wiring harness electrical connector. The right rear Shock Absorber and Shock Absorber air line need separation when rpo z55 exists during this process. Carefully detach the right rear wheel speed sensor wiring harness electrical connector clip from the frame yet avoid displacing the rear suspension sensor link rod from the position sensor ball stud. Use a nut spinner to separate the right rear automatic level control sensor link rod ball from its ball stud after supporting the sensor lever. Apply an adjustable jack to support the rear axle before you disassemble the right axle tie rod bolt and nut , the rear axle vent hose, and the vent hose swivel clip from the rear brake crossover pipe (if required). First, detach the right rear stabilizer shaft link to frame bolt along with the corresponding nut followed by removing the right rear stabilizer shaft link from the frame and finally the right rear Shock Absorber lower bolt together with its nut. Lower the right side of the rear axle while removing the Muffler carefully by taking out its nuts that connect it to the catalytic converter and separating the hanger. To remove the Muffler assembly both yukon denali and escalade owners should first apply lubrication to the exhaust system hangers and the resonator insulator. Following this, mutual help allows removing the exhaust system hangers (4, and 5) and the resonator insulator before Muffler assembly removal. Perform the same procedure on all insulators of the exhaust system hangers (3, 4, and 5) and for the insulator near the resonator for yukon xl vehicles with yukon denali xl and escalade esv and escalade ext variants. You should avoid stretching the flex coupler beyond its limits to avoid damage inside the system. After lubricating the insulators once more than add the Muffler assembly together with insulators to the exhaust system hangers (3, 4, and 5) and the insulator near the resonator. Install the insulators to exhaust system hangers (2, 3) and the insulator near the resonator after reapplying lubrication for vehicles classed as yukon denali or escalade. Secure the Muffler to catalytic converter nuts with 45 nm (33 lb ft) torque and secure the insulator to its designated hanger. Raise the rear axle using the adjustable jack to position it correctly and fasten the right rear Shock Absorber lower bolt and nut with a torque of 95 nm (70 lb ft). Begin by attaching the right rear stabilizer shaft link to the frame structure then bolt and start tightening the right rear stabilizer shaft link to frame assembly to 65 nm (48 lb ft). Put the right rear axle tie rod bolt and nut into place then tighten them to 105 nm (77 lb ft) and replace the rear axle vent hose and vent hose swivel clip when needed. Attach the right rear link rod to ball studs through hose clamp pliers (J 38185) while making sure the harness clip of the rear axle maintains proper orientation. The installation process requires you to attach the right rear wheel speed sensor wiring harness clips to the frame and Control Arm Bracket followed by connecting the right rear wheel speed sensor wiring harness electrical connector clip to the frame. For vehicles with rpo z55 you must also connect the right rear air line and chassis wiring harness electrical connector to the right rear Shock Absorber before you connect the chassis wiring harness electrical connector to the right rear wheel speed sensor wiring harness electrical connector . Replace the right rear wheel with its tire after completing the procedure.