Catalytic Converter Replacement (LY6 with Exhaust Flange)

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Catalytic Converter (LY6 With Exhaust Flange)

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
WARNING: Refer to Exhaust Service Warning . WARNING: Refer to Hot Exhaust System Warning . Preliminary Procedure Remove the engine skid plate (if equipped). Refer to Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ) . Remove the transmission support crossmember. Refer to Transmission Support Crossmember Replacement (2WD 1500/2500) or Transmission Support Crossmember Replacement (4WD 1500/2500) or Transmission Support Crossmember Replacement (2WD 2500 HD/3500) or Transmission Support Crossmember Replacement (4WD 2500 HD/3500) . Disconnect the oxygen sensors. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 Heated Oxygen Sensor Replacement - Bank 2 Sensor 2
1	Left Exhaust Manifold Nut (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten: 50 N.m (37 lb ft)
2	Seal Tighten: 22 N.m (16 lb ft)
3	Right Exhaust Manifold Nut (Qty: 3) Tighten: 50 N.m (37 lb ft)
4	Seal
5	Muffler Nut (Qty: 2) Tighten: 45 N.m (33 lb ft)
6	Catalytic Converter