Product Description
The DORMAN 300-825 ENGINE COOLING FAN PULLEY BRACKET is a direct-fit replacement designed for 2001-2004 GM Silverado/Sierra 2500HD and 3500HD trucks equipped with the 6.6L Duramax LB7 diesel engine, as well as 2003-2004 GM C4500/C5500 Kodiak and TopKick commercial chassis applications.
This bracket supports the cooling fan pulley assembly and helps maintain proper belt alignment and accessory drive stability. Over time, factory pulley brackets can develop bearing wear, cracking, or mounting issues that lead to belt noise, pulley misalignment, vibration, or cooling fan problems.
The Dorman 300-825 assembly is engineered as a direct OE-style replacement for reliable fitment and long-term durability in towing, work truck, fleet, and daily-driven diesel applications.
FEATURES
- Direct-fit replacement cooling fan pulley bracket
- Fits 2001-2004 GM 6.6L Duramax LB7 diesel engines
- Supports proper fan pulley and belt alignment
- Helps eliminate pulley wobble and belt noise
- OE-style design for straightforward installation
- Ideal for work trucks, towing, fleet, and maintenance repairs
- Manufactured to meet or exceed OEM fitment standards
FITMENT
- 2001 Chevrolet Silverado 2500HD 6.6L Duramax LB7
- 2001 Chevrolet Silverado 3500 6.6L Duramax LB7
- 2001 GMC Sierra 2500HD 6.6L Duramax LB7
- 2001 GMC Sierra 3500 6.6L Duramax LB7
- 2002 Chevrolet Silverado 2500HD 6.6L Duramax LB7
- 2002 Chevrolet Silverado 3500 6.6L Duramax LB7
- 2002 GMC Sierra 2500HD 6.6L Duramax LB7
- 2002 GMC Sierra 3500 6.6L Duramax LB7
- 2003 Chevrolet Silverado 2500HD 6.6L Duramax LB7
- 2003 Chevrolet Silverado 3500 6.6L Duramax LB7
- 2003 GMC Sierra 2500HD 6.6L Duramax LB7
- 2003 GMC Sierra 3500 6.6L Duramax LB7
- 2004 Chevrolet Silverado 2500HD 6.6L Duramax LB7
- 2004 Chevrolet Silverado 3500 6.6L Duramax LB7
- 2004 GMC Sierra 2500HD 6.6L Duramax LB7
- 2004 GMC Sierra 3500 6.6L Duramax LB7
- 2003 GM C4500 Kodiak 6.6L Duramax LB7
- 2003 GM C5500 Kodiak 6.6L Duramax LB7
- 2003 GM TopKick 6.6L Duramax LB7
- 2004 GM C4500 Kodiak 6.6L Duramax LB7
- 2004 GM C5500 Kodiak 6.6L Duramax LB7
- 2004 GM TopKick 6.6L Duramax LB7
WHAT'S INCLUDED
- Dorman 300-825 cooling fan pulley bracket assembly
CROSS-REFERENCE & RELATED PRODUCTS
- ACDELCO OEM FAN CLUTCH FOR LB7 DURAMAX
- GATES K080840HD HEAVY DUTY SERPENTINE BELT
- MERCHANT AUTOMOTIVE WATER PUMP KIT
- DURAMAX COOLING SYSTEM COMPONENTS
WHY REPLACE THE FAN PULLEY BRACKET?
A worn or damaged cooling fan pulley bracket can cause serpentine belt noise, pulley wobble, improper accessory alignment, cooling system vibration, and premature belt wear. Replacing the bracket assembly helps restore proper belt tracking and accessory drive operation on high-mileage Duramax trucks.
SPECIFICATIONS
| Specification | Details |
|---|---|
| Manufacturer | Dorman |
| Part Number | 300-825 |
| OEM Cross Reference | 12563284 |
| Engine Compatibility | 6.6L Duramax LB7 |
| Fitment Years | 2001-2004 |
| Application | Cooling fan pulley support bracket |
| Installation | Direct-fit replacement |
| UPC / GTIN-12 | 019495420289 |
| Prop 65 | Warning: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. |
FAQ
What does the cooling fan pulley bracket do?
The bracket supports the cooling fan pulley assembly and helps maintain proper serpentine belt alignment and accessory drive stability.
What are common symptoms of a failing fan pulley bracket?
Common symptoms include belt squealing, pulley wobble, abnormal vibration, cooling fan noise, uneven belt wear, and accessory drive misalignment.
Will Dorman 300-825 fit Kodiak and TopKick trucks?
Yes. This bracket fits select 2003-2004 GM Kodiak and TopKick commercial chassis equipped with the 6.6L Duramax LB7 diesel engine.
Is this a direct replacement for the factory bracket?
Yes. Dorman 300-825 is engineered as a direct-fit OE-style replacement for factory cooling fan pulley bracket assemblies.
