Seller notes

4L80-E, 4L85-E Boost Valve Kit Part No. 34200-01K O-Ring style. Kit can be retrofit to back to '89 units. See instructions for details. Common problems in vehicles with GM 4L80-E and 4L85-E transmissions 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 li...

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