GM 15756876
Muffler W/Tpipe

To change the Muffler, it is essential to use protective goggles and gloves so that if you fall rust and sharp edges might cause injury, and also wait for the exhaust system to cool when servicing to avoid being burnt. Start with lifting the vehicle and supporting the Muffler assembly. Loosen the 3 nuts holding the Muffler assembly to the Catalytic Converter assembly. To make removal easier, apply lubricant (GM P/N 12345884) to the rubber hangers of the Muffler unit and remove it from the front and rear and tailpipe hangers before detaching it from the vehicle. During installation, check to be sure the exhaust system is aligned properly and leave the bolts or nuts loose until the alignment is correct, then tighten them finger tight from front to rear. Change the worn exhaust system longs, window bracket and clamps to maintain alignment. Make sure to apply replacement parts that are up to oem standards in order to replace the Muffler it's important to replace the tailpipe as well and do this by using new nuts on connecting the Exhaust Pipe to the Exhaust Manifold while cleaning the manifold stud thread with a wire brush first. Re-lubricate the rubber hangers using rubber lubricant (GM P/N 12345884) before mounting it on the vehicle and connecting the Muffler assembly to the rear hanger, tailpipe hanger, and front hanger. Finally, install the 3 nuts connecting Muffler assembly and Catalytic Converter assembly, and tighten them to 40 nm (30 ft. Lbs).

Protective goggles and gloves should always be worn during Muffler replacement because they prevent injuries from landing rust and the sharp edges. Service the exhaust system when it has reached a safe temperature to prevent burns. Penetrating oil should be applied to bolt threads in case of resistance. Climb the vehicle before you begin to support the Muffler assembly. You must detach the 3 nuts between the Muffler assembly and Catalytic Converter assembly. The Muffler assembly becomes easier to remove after applying rubber lubricant gm p/n 12345884 to the rubber hangers and separating the assembly from its hanger brackets at the front, rear, and tailpipe location. Inspect the exhaust system for correct alignment before tightening sequence starts with all bolts or nuts installed loosely until alignment is achieved then follow with rear-to-front tightening. Exhaust system alignment remains optimal only when you replace all worn-down hangers, brackets, and clamps. When installing new exhaust system components use oem replacement parts and replace the tailpipe with each new Muffler installation and begin every connection with new nuts while using a wire brush to clean the manifold stud threads beforehand. If you use rubber lubricant gm p/n 12345884 you must reapply it before mounting the Muffler assembly into the car and attaching it to the tailpipe hanger, rear hanger, and front hanger. Secure the Muffler assembly to the Catalytic Converter assembly by using the 3 nuts which require 40 nm (30 ft. Lbs.) torque.

Replace the tailpipe when replacing the muffler.