GM 25940555
Muffler & Pipe

Vehicles equipped with l92 need their exhaust Muffler replacement started by taking out the right rear wheel together with its tire. You must disconnect the electrical connector responsible for chassis wiring from the right rear wheel speed sensor wiring harness electrical connector . To replace the exhaust Muffler on vehicles with rpo z55 the technician should detach the chassis wiring harness electrical connector from both the right rear Shock Absorber and the right rear air line from the Shock Absorber. Separate the frame clip of the right rear wheel speed sensor wiring harness electrical connector while keeping the rear suspension sensor link rod on the position sensor ball stud. Ensure the sensor lever has adequate support before twisting the link rod ball to disconnect it from the ball stud on the sensor. Support the rear axle using an adjustable jack before you remove the right axle tie rod bolt and nut , the rear axle vent hose alongside the vent hose swivel clip off the rear brake crossover pipe if required. Start by removing the right rear stabilizer shaft link to frame bolt and nut followed by the right rear stabilizer shaft link from the frame. To access the Muffler you must first lower the right side of the rear axle by removing the right rear Shock Absorber lower bolt and nut . Proceed to remove the Muffler to catalytic converter nuts before separating the hanger. To optimize removal of the Muffler assembly on yukon denali or escalade vehicles, apply lubricant to the hanger insulators before helper personnel remove exhaust system hangers (4 and 5) and the resonator insulator. Repeat the protocol you performed on the insulators (3, 4, and 5) and resonator insulator before you take out the Muffler assembly for yukon xl, yukon denali xl, escalade esv, and escalade ext vehicles. After vehicle removal it is necessary to keep the flex coupler from overstretching to guard against internal harm. The procedure requires lubrication for all insulators when installing a yukon xl, yukon denali xl, escalade esv or escalade ext. Assistance is needed to install the Muffler assembly and insulators to exhaust system hangers (3, 4, and 5) and the insulator near the resonator. For yukon denali and escalade owners using this repair procedure they should first need to lubricate the insulators following installation of the Muffler assembly onto the exhaust system hangers (2 and 3). Install Muffler to catalytic converter nuts and tighten them to 45 nm (33 lb ft) before securing the insulator to the hanger. Create the necessary height for the rear axle by using an adjustable jack before installing and securing both the right rear Shock Absorber lower bolt and nut at 95 nm (70 lb ft) torque and the right rear stabilizer shaft link to the frame and its bolt and nut at 65 nm (48 lb ft). Tighten the right rear axle tie rod bolt and nut to 105 nm (77 lb ft) then reinstall the rear axle vent hose and its swivel clip if required. First use the j 38185 to attach the right rear link rod between the ball studs and sensors before securing corresponding clips to the frame and Control Arm Bracket. Next, position the right rear wheel speed sensor wiring harness electrical connector clip to the frame. An rpo z55-equipped vehicle requires the right rear air line and chassis wiring harness electrical connector connections between Shock Absorber and right rear wheel speed sensor wiring harness electrical connector . Install the right rear tire together with the wheel as the final step.

Lubricate the insulators for installation.

Connect the muffler assembly to the resonator, ensuring to position it to the three-way catalytic converter norma clamp bolt and tighten to 28 Nm (21 lb ft).

Connect the chassis wiring harness electrical connector to the right rear wheel speed sensor wiring harness electrical connector before lowering the vehicle.