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O-Ring seal between pin and 2nd Gear piston
Overdrive Band
6061 Billet aluminum with design refinements for additional strength
GM 4L80-E and 4L85-E pumps have end plugs at the pressure regulator and TCC shift valves that seal signal oil required to stroke the valve
Manufacturer Part Number: T74007E-3
4L80E 4L85E Transmission Boost Valve O-Ring Style Sonnax 34200-01K Featured Products O-Ring seal between pin andManufacturer Part Number: 34200 01K Brand: Sonnax Fitment Type: Direct Replacement Manufacturer Warranty: Yes 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
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