How to replace the catalytic converter on 6.0L and 8.1L engines on GMC Sierra 3500?

On 6.0l and 8.1l engines, raising and supporting the vehicle first, then, using transmission jack, supporting the transmission is necessary to replace the Catalytic Converter. Strip the transmission mount transmission support nuts and lift up the transmission off the support and remove the transmission support crossmember bolts and crossmember. After that, detach the Muffler, disconnect the connector position assurance (CPA) retainers and the Oxygen Sensor electrical connectors (1, 2). Loosen the right exhaust manifold pipe nuts and remove the left exhaust manifold pipe nuts. Loosen the transmission slightly by using the transmission jack and pull out the Catalytic Converter, shifting its hanger out of the Exhaust Pipe hanger bracket. If your vehicle is equipped with a 6.0l engine and can be ordered with its regular production option (RPO) y91, then remove the Catalytic Converter again and slide the hanger out. When replacing the Catalytic Converter, apply anti-seize compound gm p/n 12377953 or equivalent to the threads of old oxygen sensors and install them, making a total torque of 42 nm (31 ft. Lbs.). For a 6.0l with rpo y91, install a new exhaust seal to exhaust manifold then slide the Catalytic Converter hanger into the Exhaust Pipe-hanger bracket. Install one more new exhaust seal to the exhaust manifold, the left one again, then install the left exhaust manifold pipe nuts. Tighten the right exhaust manifold pipe nuts to 50 nm (39 ft. Lbs. ). Raise the transmission a bit with the use of the jack, connect the Oxygen Sensor electrical connectors (1, 2) as well as the cpa retainers. Reinstall the Muffler, the transmission support crossmember and its bolts, tightening to 95 nm(70 ft. Lbs.). Lower the transmission onto the support, install transmission mount on the transmission support nuts and tighten them to 40 nm (30 ft lbs.). Finally, take the support off of the transmission and lower the vehicle.

OEM GMC Sierra 3500 Catalytic Converter

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12 Catalytic Converters found

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GMC Sierra 3500 Catalytic Converter
Part Number: 19420124
$970.06 MSRP: $1443.93
You Save: $473.87 (33%)
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Front Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 15754088, 15755463, 10395213
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003 GMC Sierra 3500 | Base, SLE, SLT | 8 Cyl 6.0 L GAS
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GMC Sierra 3500 Catalytic Converter
Part Number: 19420109
$933.52 MSRP: $1389.07
You Save: $455.55 (33%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Front Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 10395214, 15755464, 15754087
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003 GMC Sierra 3500 | Base, SLE, SLT | 8 Cyl 6.0 L GAS
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GMC Sierra 3500 Catalytic Converter
Part Number: 15229341
Product Specifications
- Other Name: Converter, Catalytic Converter; Exhaust Pipe; Converter & Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006 GMC Sierra 3500 | SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
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GMC Sierra 3500 Catalytic Converter, Driver Side
Part Number: 19420127
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Exhaust Pipe; Front Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Position: Driver Side
- Replaces: 15199817
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
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GMC Sierra 3500 Catalytic Converter
Part Number: 15761128
Product Specifications
- Other Name: Converter, Catalytic Converter; Exhaust Pipe; Front Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2004 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
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GMC Sierra 3500 Catalytic Converter, Driver Side
Part Number: 15755166
Product Specifications
- Other Name: Converter; Exhaust Pipe; Front Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Position: Driver Side
- Replaces: 15037350
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2002 GMC Sierra 3500 | Base, SL, SLE, SLT | 8 Cyl 6.0 L GAS
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GMC Sierra 3500 Catalytic Converter
Part Number: 15104249
Product Specifications
- Other Name: Converter, Catalytic Converter; Exhaust Pipe; Converter & Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2005 GMC Sierra 3500 | Base, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
View related parts
GMC Sierra 3500 Catalytic Converter, Passenger Side
Part Number: 15091830
Product Specifications
- Other Name: Converter Assembly-3Way Catalytic (W/Exhaust Manifold P; Exhaust Pipe; Front Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Position: Passenger Side
- Replaces: 15013591
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2006, 2001-2002 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
View related parts
GMC Sierra 3500 Catalytic Converter, Driver Side
Part Number: 15077755
Product Specifications
- Other Name: Converter Assembly-3Way Catalytic (W/Exhaust Manifold P; Exhaust Pipe; Front Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Position: Driver Side
- Replaces: 15729035
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2006, 2001-2002 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
View related parts
GMC Sierra 3500 Catalytic Converter, Passenger Side
Part Number: 15077752
Product Specifications
- Other Name: Converter Assembly-3Way Catalytic (W/Exhaust Manifold P; Exhaust Pipe; Front Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2005 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
View related parts
GMC Sierra 3500 Catalytic Converter, Driver Side
Part Number: 15077751
Product Specifications
- Other Name: Converter Assembly-3Way Catalytic (W/Exhaust Manifold P; Exhaust Pipe; Front Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Position: Driver Side
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2005 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS
View related parts
GMC Sierra 3500 Catalytic Converter
Part Number: 15070466
Product Specifications
- Other Name: Converter; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2002 GMC Sierra 3500 | Base, SL, SLE, SLT | 8 Cyl 6.0 L GAS, 8 Cyl 8.1 L GAS

GMC Sierra 3500 Catalytic Converter

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GMC Sierra 3500 Catalytic Converter Parts Questions & Experts Answers

Catalytic Converter, Driver Side
15077751
Q: How to replace the catalytic converter on 6.0L and 8.1L engines on GMC Sierra 3500?
A: On 6.0l and 8.1l engines, raising and supporting the vehicle first, then, using transmission jack, supporting the transmission is necessary to replace the Catalytic Converter. Strip the transmission mount transmission support nuts and lift up the transmission off the support and remove the transmission support crossmember bolts and crossmember. After that, detach the Muffler, disconnect the connector position assurance (CPA) retainers and the Oxygen Sensor electrical connectors (1, 2). Loosen the right exhaust manifold pipe nuts and remove the left exhaust manifold pipe nuts. Loosen the transmission slightly by using the transmission jack and pull out the Catalytic Converter, shifting its hanger out of the Exhaust Pipe hanger bracket. If your vehicle is equipped with a 6.0l engine and can be ordered with its regular production option (RPO) y91, then remove the Catalytic Converter again and slide the hanger out. When replacing the Catalytic Converter, apply anti-seize compound gm p/n 12377953 or equivalent to the threads of old oxygen sensors and install them, making a total torque of 42 nm (31 ft. Lbs.). For a 6.0l with rpo y91, install a new exhaust seal to exhaust manifold then slide the Catalytic Converter hanger into the Exhaust Pipe-hanger bracket. Install one more new exhaust seal to the exhaust manifold, the left one again, then install the left exhaust manifold pipe nuts. Tighten the right exhaust manifold pipe nuts to 50 nm (39 ft. Lbs. ). Raise the transmission a bit with the use of the jack, connect the Oxygen Sensor electrical connectors (1, 2) as well as the cpa retainers. Reinstall the Muffler, the transmission support crossmember and its bolts, tightening to 95 nm(70 ft. Lbs.). Lower the transmission onto the support, install transmission mount on the transmission support nuts and tighten them to 40 nm (30 ft lbs.). Finally, take the support off of the transmission and lower the vehicle.

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