Product Details

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4T65E transmissions often suffer converter failure during high line pressure conditions such as max adapts or various codes due to excessive apply pressure. The torque converter piston is designed for operating pressures of 135 psi but the OEM apply pressure relief doesn’t crack until 175 psi and can allow apply pressure to increase beyond that to over 225 psi. At these high pressures the piston deflects, destroying the piston and lining. The new Sonnax apply relief valve 84757-01K is calibrated to crack at 135 psi to prevent excess apply valve. Features and Benefits: Correctly calibrated to release pressure above 135 psi. Allows the original chain cover to be reused.