TH400 Turbo 400 Transmission Pan Gasket Blue Silicone with Steel Core wall thickness and are formed

wall thickness and are formed from 4130 chromoly steel

If it has to seal right the first time Speedmaster has what you need

and 3/8 in

this pulley is designed to provide superior durability and efficiency

solving issues associated with the weak pressed steel plate bases

TH400 Turbo 400 Transmission Pan Gasket Blue Silicone with Steel Core wall thickness and are formedSpeedmaster gaskets are designed for today's performance transmissions, nothing worse than a leaky transmission, and leaks can lead to the death of your performance transmission. Constructed from a cellulose nitrile material that features excellent tensile strength and superior blowout resistance, and their latex coating conforms to minor sealing surface irregularities for a better seal.