Installation Procedure

Fig 1: Insulators & Muffler Hangers

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Apply lubricant to the insulators to aid in installation.

Install the insulators to the muffler hangers.
With the aid of an assistant, slide the muffler forward in order to install the muffler to the catalytic converter.
Install the insulators to the frame hangers.

Fig 2: Exhaust Muffler Nuts

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FASTENER NOTICE .

Tighten the exhaust pipe clamp bolt and muffler nuts.
Tighten:
- Tighten the exhaust muffler nuts to 40 N.m (30 lb ft).
- Tighten the exhaust pipe clamp to 44 N.m (33 lb ft).
Raise the rear suspension to ride height.
Connect the right hand air suspension level sensor, if equipped. Refer to AIR SPRING LEVELING SENSOR REPLACEMENT .
Install the right hand shock lower bolt and nut.
Tighten: Tighten the bolt and nut to 105 N.m (77 lb ft)
Install the rear track bar bolt and nut.
Tighten: Tighten the bolt and nut to 105 N.m (77 lb ft)
Install the right hand lower stabilizer nut.
Tighten: Tighten the nut to 72 N.m (53 lb ft)
Remove the jack stands from under the rear axle.
Lower the vehicle. Ensure the air springs seat properly as the vehicle is being lowered.
If equipped with air suspension, start the engine and idle for 2 minutes to ensure the air spring leveling system is functioning properly.