Product Details

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Common problems in vehicles with a 4L80-E transmission are uncontrollable line rise (upward of 500-600 psi), high line pressure in reverse, buzzing noise, broken direct clutch drums and/or broken cases. These problems are usually caused by reverse boost oil that enters the torque signal circuit due to a wear-created cross leak at the sleeve. High line pressure and buzz is created by oil leakage past the aluminum balance plug. Features & Benefits: Hardened steel boost valve with over 20% wider spools to provide better durability and increased sealing contact area. Boost valve spools have annular grooves to reduce side loading that causes wear. Valve and sleeve are manufactured to close tolerances to restore proper clearance and hydraulic integrity. Kit includes a replacement aluminum balance oil plug with an o-ring to ensure proper sealing and adequate back pressure on the pressure regulator valve. Kit contains instructions to retrofit parts dating back to 1989.