Gates 7640 Accessory Drive Belt

Gates 7640 High Capacity V-Belt Overview

The Gates 7640 is a High Capacity V-Belt (Standard) built for demanding accessory drive systems. It uses a notched EPDM construction with polyester cord reinforcement to help maintain grip, reduce slippage, and control noise as engine temperatures rise.

Compatible With classic Chrysler, Dodge, Buick, and Oldsmobile accessory drive applications, this belt is sized for specific alternator, air conditioning, fan, power steering, and steering pump setups. The Gates 7640 is a direct replacement choice for drivers restoring older engine drive systems that need stable belt performance under heat and load.

Key Features

• High Capacity V-Belt (Standard) design for accessory drive service
• Notched construction helps the belt flex and track smoothly
• EPDM belt material for heat resistance and long service life
• Polyester cord material for strength and dimensional stability
• 36-degree angle and HC41 section designation
• Effective length: 64 in. / 1626 mm
• Outside circumference: 64.81 in. / 1646 mm
• Top width: 0.41 in. / 10 mm

Product Details

Gates built the 7640 for engine drives that see constant heat cycling and accessory load changes. The variable notched profile tightens on the drive as temperatures increase, which helps reduce belt slip and supports quieter operation. This makes it a practical replacement for vehicles using alternator and air conditioning drives, fan and air conditioning drives, and other listed accessory positions. This part cross-references Dayco (e.g., 15640, 15650) for the same application.

Fits 1977-1978 Chrysler New Yorker, Alternator and Air Conditioning; Fits 1978 Chrysler New Yorker, Alternator; Fits 1977-1978 Chrysler Newport, Alternator and Air Conditioning; Fits 1978 Chrysler Newport, Alternator; Fits 1977-1978 Dodge Charger, Alternator and Air Conditioning; Fits 1977-1978 Dodge Charger, Alternator; Fits 1978 Dodge Magnum, Alternator and Air Conditioning; Fits 1978 Dodge Magnum, Alternator; Fits 1977-1978 Dodge Monaco, Alternator and Air Conditioning; Fits 1977-1978 Dodge Monaco, Alternator.

Additional fitment includes 1973-1976 Oldsmobile 98, Custom Cruiser, Cutlass, Cutlass Salon, Cutlass Supreme, Delta 88, and 1965-1967 Oldsmobile 98, Cutlass, Delta 88, Starfire in fan, air conditioning, power steering, and steering pump applications. For older Chrysler and Dodge vehicles, the Gates 7640 also appears in alternator and air conditioning configurations on 1967-1976 models listed in the fitment data.

Common Problems This Belt Can Address

• Belt squeal during startup or under accessory load
• Slippage caused by heat buildup in the engine bay
• Reduced accessory drive performance from a worn or glazed belt
• Noise from an aging V-belt in alternator or A/C service
• Fitment issues when replacing an obsolete OE-style belt size

Installation Notes and Tips

Verify the belt length, top width, and section designation against the existing belt or service information before installation. Check pulley alignment, tensioner condition where applicable, and pulley wear before fitting the new belt. After installation, recheck belt tension and inspect tracking once the engine reaches operating temperature.

Quality Assurance

Gates manufactures the 7640 as a durable replacement accessory drive belt for demanding engine applications. Its EPDM construction, notched profile, and polyester reinforcement are selected to support consistent operation in heat-prone accessory drive systems.