Dayco 5040378K1 Serpentine Belt Drive Component Kit

The Dayco 5040378K1 Serpentine Belt Drive Component Kit is a complete, systems-based solution for servicing the front-end accessory drive on a wide range of light-duty trucks, vans, and SUVs. This 2-piece kit includes a serpentine belt and automatic belt tensioner, providing everything needed for a thorough and proper repair in a single purchase.

Key Features:

• Complete Kit: Includes a serpentine belt and belt tensioner — all OE-equivalent components for a full accessory drive service
• Premium EPDM Belt Construction: The multi-ribbed serpentine belt is built with EPDM rubber compounds that resist cracking, wear, corrosion, and heat for reliable long-term performance
• Flat Spring Tensioner Technology: The automatic belt tensioner features flat spring technology for consistent belt tension and reduced vibration
• OE-Equivalent Fit: Engineered to match OE specifications in form, fit, and function — no modifications required for installation
• Multilingual Installation Guide: Kit includes alignment tips and application-specific installation information
• Systems Approach to Maintenance: Designed to replace all worn drive components simultaneously, preventing premature failure of new parts caused by worn mating components

Dayco's serpentine belt kits take the guesswork out of sourcing individual components. By replacing the belt and tensioner together, technicians can restore the entire accessory belt drive system with confidence. Dayco has been a global leader in belt and drive system manufacturing since 1905, delivering products engineered for economy, efficiency, and durability.