ATP Parts JG-50 Transmission Oil Pan Gasket

Transmission Oil Pan Gasket for THM400 Applications

ATP Parts JG-50 is a transmission oil pan gasket made for exact-fit replacement on a wide range of GM, Jaguar, and Rolls-Royce applications. It is a fibre gasket built for THM400-equipped vehicles where listed, helping restore a proper seal at the transmission pan.

Key Features

• Transmission oil pan gasket for automatic transmission service
• Fibre construction for listed applications
• Exact-fit replacement from ATP Parts
• Direct replacement for ATP JG-50
• Cross-references MAHLE W39341 and Pioneer Automotive Industries 749020 for the same application

Fitment and Application Details

Compatible with a broad range of classic GM trucks, vans, SUVs, and specialty vehicles. Fits 1984-1990 Chevrolet C10, C20, C30, K10, K20, K30, K5 Blazer, G10, G20, G30, P20, P30, R10, R20, R30, V10, V20, V30, C1500, C2500, C3500, K1500, K2500, K3500, R1500 Suburban, R2500 Suburban, R3500, V1500 Suburban, V2500 Suburban, and V3500, N/A. Fits 1984-1990 GMC C1500, C2500, C3500, G1500, G2500, G3500, Jimmy, K1500, K2500, K3500, P3500, R1500 Suburban, R2500 Suburban, R3500, V1500 Suburban, V2500 Suburban, and V3500, N/A. Fits 1984-1990 Cadillac Fleetwood and Brougham, N/A. Fits 1985-1990 Jaguar XJ12 and XJS, N/A; Fits 1987-1990 Jaguar XJ6, N/A; Fits 1985-1990 Rolls-Royce Silver Spirit and Silver Spur, N/A; Fits 1985-1987 Rolls-Royce Camargue, N/A; Fits 1986-1990 Rolls-Royce Corniche II, N/A.

Common Problems This Gasket Helps Address

• Transmission fluid seepage at the oil pan rail
• Poor sealing after pan removal or service
• Fluid leaks caused by aged or compressed gasket material
• Maintenance issues on THM400-equipped classic vehicles
• Repeat leaks from an incorrect or worn replacement gasket

Installation Notes and Tips

Verify transmission type before ordering, especially on applications marked THM400 only. Clean the pan and case sealing surfaces thoroughly before installation, and inspect the pan flange for distortion. Confirm the gasket matches the vehicle’s listed year, make, and model, including GM truck, van, and Suburban applications such as Chevrolet C10, GMC Jimmy, and Cadillac Brougham.

Quality Assurance

ATP Transmission Seals and Gaskets are positioned as exact-fit replacement parts for transmission sealing service. ATP Parts JG-50 is built to match the listed applications and support a proper pan seal on compatible vehicles.