An automatic belt tensioner keeps the serpentine belt at the right tension as it stretches and as accessory loads change. A weak tensioner lets the belt slip and chirp. This Gates DriveAlign tensioner is built to replace the original unit.

Gates 39666 DriveAlign Belt Tensioner Features:

• Maintains Correct Serpentine Belt Tension
• Designed to Match OE Fit and Function
• Sold Individually

Vehicle Applications:

• 2018-2025 Chevrolet Express 2500 4.3L V6, 6.6L V8
• 2018-2025 Chevrolet Express 3500 4.3L V6, 6.6L V8
• 2021-2026 Chevrolet Express 4500 6.6L V8
• 2018-2025 Chevrolet Express Cargo 4.3L V6, 6.6L V8
• 2021-2025 Chevrolet Express Pasajeros 6.6L V8
• 2021-2023 Chevrolet LCF 3500 6.6L V8
• 2024-2025 Chevrolet LCF 3500HG 6.6L V8
• 2021-2026 Chevrolet LCF 4500 6.6L V8
• 2024-2026 Chevrolet LCF 4500HG 6.6L V8
• 2024-2026 Chevrolet LCF 5500HG 6.6L V8
• 2024-2025 Chevrolet LCF 5500XG 6.6L V8
• 2020-2026 Chevrolet Silverado 2500 HD 6.6L V8
• 2020-2026 Chevrolet Silverado 3500 HD 6.6L V8
• 2023-2026 Freightliner MT45 6.0L V8, 6.6L V8
• 2023-2026 Freightliner MT55 6.0L V8, 6.6L V8
• 2018-2025 GMC Savana 2500 4.3L V6, 6.6L V8
• 2018-2025 GMC Savana 3500 4.3L V6, 6.6L V8
• 2021-2026 GMC Savana 4500 6.6L V8
• 2020-2025 GMC Sierra 2500 HD 6.6L V8
• 2020-2025 GMC Sierra 3500 HD 6.6L V8
• 2021 Isuzu NPR-HD 6.6L V8