ACDelco 39129 Automatic Belt Tensioner Assembly with Pulley

The ACDelco 39129 Professional Automatic Belt Tensioner Assembly is a premium aftermarket replacement component designed for accessory belt drive systems that require an automatic tensioner. This complete assembly includes both the tensioner mechanism and pulley in a single unit for convenient installation.

Key Features:

• Ensures proper belt tension, alignment, and damping for superior accessory drive performance
• Patented vibration damping system increases the service life of the tensioner, belt, and accessory components
• Torsional round spring design provides consistent tension throughout the belt's life
• Sealed design prevents spring contamination for enhanced durability
• Designed for V-ribbed serpentine belt applications
• Engineered, tested, and backed by General Motors quality standards

ACDelco Professional components go through an 18-step quality approval process to ensure the same reliable performance, precise engineering, and superior reliability as original equipment parts. This tensioner assembly provides full coverage for domestic, import, and heavy-duty automotive applications.