Dorman 419-400 Accessory Drive Belt Tensioner Assembly - Main Drive

Reliable Accessory Drive Belt Tensioner for Chevrolet and GMC Trucks

The Dorman 419-400 Accessory Drive Belt Tensioner Assembly is engineered to maintain proper tension on the accessory drive belt system in heavy-duty Chevrolet and GMC trucks. Designed with durable metal and plastic components, this tensioner assembly ensures consistent belt performance and longevity for models like the Silverado 2500 HD and Sierra 3500 Classic.

• Constructed with a combination of metal and plastic materials for durability and lightweight performance
• Features a hexagonal bolt head type for secure and easy installation
• Includes a flanged pulley made of plastic to reduce wear and noise
• Measures 3.274 inches in length with a 3.05-inch outside diameter pulley
• Designed with 5 grooves and a 2-inch inside diameter bearing bore for optimal belt alignment
• Compatible with multiple Chevrolet and GMC heavy-duty truck models

Durable Design and Precise Fitment

The Dorman 419-400 tensioner assembly combines metal and plastic materials to provide a balance of strength and reduced weight. The hexagonal bolt head type allows for straightforward installation using standard tools. Its pulley is flanged and constructed from plastic, which helps minimize belt slippage and extends the life of the accessory drive belt. With a width of 1.04 inches and a pulley outside diameter of 3.05 inches, this tensioner assembly is engineered to fit precisely within the accessory drive belt system of Chevrolet Avalanche 2500, GMC Sierra 2500 HD Classic, and other compatible models.

Compatible Chevrolet and GMC Models

• Chevrolet Avalanche 2500
• Chevrolet Silverado 2500 HD and 3500 Classic
• GMC Sierra 2500 HD, 2500 HD Classic, 3500, and 3500 Classic
• Chevrolet Suburban 2500
• GMC Yukon XL 2500

Common Issues Addressed by This Tensioner Assembly

• Accessory drive belt slipping or squealing
• Improper belt tension causing premature belt wear
• Noise from worn or damaged tensioner pulley
• Loss of power steering or alternator function due to belt issues
• Vibration or misalignment in the accessory drive belt system

Installation Notes and Tips

Ensure the engine is cool before beginning installation. Use a hex socket or wrench to remove the existing tensioner assembly by loosening the hexagonal bolt. Verify the pulley grooves and dimensions match the replacement part to ensure proper fitment. After installation, double-check belt alignment and tension to prevent premature wear or noise. Refer to the vehicle’s service manual for torque specifications and detailed procedures.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications, providing reliable performance for heavy-duty Chevrolet and GMC trucks. The 419-400 Accessory Drive Belt Tensioner Assembly undergoes rigorous quality control to ensure durability and fitment accuracy. Please consult Dorman’s warranty policy for specific coverage details.