Seller notes

4L80-E, 4L85-E Transmission Boost Valve Kit Part No. 34200-10K With encapsulated relief valve. Common problems in vehicles with GM 4L80-E and 4L85-E transmissions include uncontrollable line rise (upward of 500 psi), high line pressure in Reverse, broken direct clutch drums and/or broken cases. These problems can be caused by excessive EPC torque signal pressure. Sonnax self-regulating boost valve kit 34200-10K eliminates these problems by limiting EPC pressure. Hardened steel boost valve has an...

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