GM 700R4 Trans Pan Gasket

The GM 700R4 Trans Pan Gasket by Mr. Gasket is an OEM-specification replacement seal engineered for General Motors 700R4 and 4L60E automatic transmissions. This gasket serves as a critical barrier between the transmission pan and the transmission case, preventing fluid leakage that can compromise shift quality, cooling efficiency, and overall drivetrain reliability. Whether you're rebuilding a classic muscle car, restoring a truck, or maintaining a high-mileage performance vehicle, this gasket is an essential component for any transmission service or pan removal.

Constructed from a cork and rubber composite material, the GM 700R4 Trans Pan Gasket provides superior sealing performance across a wide temperature range and withstands the thermal cycling typical of street and performance driving. The composite construction combines the resilience of cork with modern rubber compounds, creating a gasket that resists fluid degradation, maintains compression over time, and accommodates minor pan surface irregularities. This material choice ensures a reliable seal that prevents ATF weeping at the pan rail while allowing easy removal and replacement during routine maintenance or transmission rebuilds without damaging the pan or case surfaces.

Mechanics and DIY enthusiasts commonly install the GM 700R4 Trans Pan Gasket whenever the transmission pan is dropped for fluid and filter service, or during a complete transmission rebuild. The gasket is compatible with both the original 700R4 transmission and its modern equivalent, the 4L60E, making it essential for anyone working on second and third-generation Chevrolet, GMC, or Pontiac vehicles, as well as custom hot rods and engine-swapped projects that utilize these proven transmissions. Proper installation requires a clean pan surface, correct torque sequencing, and fresh transmission fluid to ensure long-term leak-free operation and consistent transmission cooling performance.