ATP Parts JG-56 Transmission Oil Pan Gasket

Transmission Oil Pan Gasket for THM425 Applications

ATP Parts JG-56 is a transmission oil pan gasket made for exact-fit replacement on select GM, Jeep, and Cadillac applications. It is built with fibre material and is listed for vehicles using the THM425 transmission, including classic Cadillac Eldorado, Oldsmobile Toronado, and Pontiac LeMans models.

• Transmission oil pan gasket for THM425-equipped vehicles
• Fibre construction for listed applications
• Exact-fit replacement from ATP Parts
• Compatible with a wide range of 1966-1978 GM and Jeep applications
• Part number JG-56 for catalog and service lookup

Fitment Details

Compatible With 1967-1978 Cadillac Eldorado, N/A; 1966-1977 Oldsmobile Toronado, N/A; 1976-1977 Pontiac LeMans, N/A; 1973-1974 Pontiac LeMans, N/A; 1975 Cadillac Fleetwood, N/A; 1973-1975 Chevrolet Malibu, N/A; 1975 Chevrolet Nova, N/A; 1970-1973 Chevrolet Nova, N/A; 1973-1974 Buick Century, N/A; 1970-1974 Buick LeSabre, N/A; 1966-1968 Buick LeSabre, N/A; 1973-1974 Buick Regal, N/A; 1966-1974 Buick Riviera, N/A; 1972-1974 Chevrolet Bel Air, N/A; 1966-1969 Chevrolet Bel Air, N/A; 1969-1974 Chevrolet Blazer, N/A; 1968-1974 Chevrolet C10 Suburban, N/A; 1968-1974 Chevrolet C20 Suburban, N/A; 1969-1974 Chevrolet Camaro, N/A; 1972-1974 Chevrolet Caprice, N/A; 1966-1969 Chevrolet Caprice, N/A; 1966-1974 Chevrolet Corvette, N/A; 1970-1974 Chevrolet El Camino, N/A; 1972-1974 Chevrolet Impala, N/A; 1966-1969 Chevrolet Impala, N/A; 1968-1974 Chevrolet K10 Suburban, N/A; 1968-1974 Chevrolet K20 Suburban, N/A; 1971-1974 Chevrolet Monte Carlo, N/A; 1968-1974 Jeep CJ5, N/A; 1974 Jeep J10, N/A; 1974 Jeep J20, N/A; 1971-1974 Jeep Wagoneer, N/A; 1966-1967 Jeep Wagoneer, N/A; 1970-1974 Pontiac Firebird, N/A; 1966-1973 Pontiac GTO, N/A; 1968-1970 GMC G15/G1500 Van, N/A; 1968-1970 GMC G25/G2500 Van, N/A; 1967-1970 Pontiac Tempest, N/A; 1969 Buick Skylark, N/A; 1967 Buick Skylark, N/A; 1966 Cadillac Eldorado, N/A; 1966 Oldsmobile Starfire, N/A. This part cross-references Pioneer Automotive Industries 749021 and Timken 14525 for the same application.

What This Gasket Helps Address

• Transmission fluid seepage at the oil pan rail
• Pan-to-case sealing issues after service
• Leaks caused by aged or compressed gasket material
• Maintenance replacement on THM425 transmission service
• Fitment matching for classic Cadillac, Buick, Chevrolet, Pontiac, GMC, and Jeep vehicles

Installation Notes and Tips

Confirm the transmission is THM425 before ordering, since several listed vehicles only use that unit. Clean the pan and case sealing surfaces thoroughly, inspect the pan flange for distortion, and follow the service manual torque sequence to help achieve an even seal. ATP Parts JG-56 is an exact-fit replacement part, so proper identification of the transmission and vehicle application is important before installation.

Quality Assurance

ATP Transmission Seals and Gaskets are positioned as exact-fit replacement parts for service work where proper sealing matters. JG-56 is cataloged for direct replacement use across the listed applications and is supported by known interchange references for parts lookup.