Dayco 15630 Accessory Drive Belt

Dayco 15630 Accessory Drive Belt Overview

The Dayco 15630 accessory drive belt is a top-cog, synthetic rubber belt built for accessory drive systems that power critical engine-driven components. With a 63-inch effective length and 36-degree angle, it is a direct-fit option for select Chevrolet P20, Chevrolet P30, GMC P2500, GMC P3500, Cadillac DeVille, Cadillac Eldorado, and other classic applications.

Built to SAE J636 and SAE J637 standards, this Dayco 15630 belt is sized for specific fan, air conditioning, power steering, air pump, and generator drive layouts. It is a practical replacement for owners searching for a Dayco 15630 accessory drive belt for older GM trucks, motor home chassis, and vintage Cadillac and Buick applications.

Key Features

• Synthetic rubber compound construction for accessory drive service
• Top-cog design for flexibility in belt routing
• Black finish with .44-inch top width
• 63-inch effective length and 63.57-inch outside circumference
• 36-degree belt angle
• Rated for operating temperatures from -35 to 175 degrees
• Built to SAE J636 and SAE J637 standards

Fitment Details

• Fits 1984-1985 GMC P3500, fan, air conditioning and power steering; incl. motor home chassis.
• Fits 1982-1984 Chevrolet P30, fan, air conditioning and power steering.
• Fits 1983 GMC P3500, fan, air conditioning and power steering; excluding motor home chassis.
• Fits 1982 Chevrolet P20, fan, air conditioning and air pump; compatible with vehicles containing air conditioning.
• Fits 1982 Chevrolet P30, fan, air conditioning and air pump; compatible with vehicles containing air conditioning.
• Fits 1982 GMC P2500, fan, air conditioning and air pump; compatible with vehicles containing air conditioning.
• Fits 1982 GMC P3500, fan, air conditioning and air pump; compatible with vehicles containing air conditioning.
• Fits 1982 GMC P3500, fan, air conditioning and power steering.
• Fits 1976-1981 Chevrolet P30, air conditioning; motor home chassis.
• Fits 1979-1981 GMC P3500, air conditioning; motor home chassis.
• Fits 1979 Chevrolet P20, air conditioning; motor home chassis.
• Fits 1976 Chevrolet P20, air conditioning; motor home chassis.
• Fits 1979 GMC P1500, air conditioning; motor home chassis.
• Fits 1971 Oldsmobile 98, fan and air conditioning.
• Fits 1971 Oldsmobile Custom Cruiser, fan and air conditioning.
• Fits 1971 Oldsmobile Delta 88, fan and air conditioning.
• Fits 1966-1967 Oldsmobile Toronado, fan, power steering and air pump; compatible with vehicles containing air conditioning.
• Fits 1966-1967 Oldsmobile Toronado, fan, power steering and air pump; w/o A.C., H.D. Cool.
• Fits 1966 Oldsmobile Cutlass, air conditioning.
• Fits 1959-1960 Cadillac DeVille, air conditioning; 63 in. belt.
• Fits 1959-1960 Cadillac DeVille, power steering; w/o A.R., w/A.C.
• Fits 1959-1960 Cadillac Eldorado, air conditioning; 63 in. belt.
• Fits 1959-1960 Cadillac Eldorado, power steering; w/o A.R., w/A.C.
• Fits 1958 Cadillac DeVille, air conditioning.
• Fits 1958 Cadillac Eldorado, air conditioning.
• Fits 1956 Buick Century, fan, generator and air conditioning.
• Fits 1954 Buick Century, fan, generator and air conditioning.
• Fits 1956 Buick Roadmaster, fan, generator and air conditioning.
• Fits 1953-1954 Buick Roadmaster, fan, generator and air conditioning.
• Fits 1954 Buick Skylark, fan, generator and air conditioning.

What This Belt Helps Address

• Squealing or slipping accessory drive belt noise
• Loss of drive to the alternator, fan, or air conditioning compressor
• Reduced power steering assist on belt-driven systems
• Wear-related cracking, glazing, or fraying on an aging belt
• Incorrect belt length on classic GM and Cadillac accessory drive setups

Installation Notes and Tips

Verify belt routing and measure the existing belt path before installation, especially on vehicles with air conditioning, power steering, or air pump accessories. Confirm the application notes for motor home chassis, excluding motor home chassis, and air-conditioning-equipped vehicles to ensure the correct Dayco 15630 fitment.

For search relevance, this belt is commonly selected for Chevrolet P20 and P30, GMC P2500 and P3500, and classic Cadillac DeVille and Eldorado accessory drive systems. This part cross-references Gates 10A1600 and Bando B2630 for the same application.

Quality Assurance

Dayco manufactures this accessory drive belt to SAE J636 and SAE J637 standards, with a synthetic rubber compound and temperature range suited to demanding underhood conditions. The Dayco 15630 is engineered for consistent belt performance in classic vehicle accessory drive systems.