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Sonnax recommends bore sizing tool 96206-BST*
Manufacturer Part Number: K70185-01
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
6061 Billet aluminum with design refinements for additional strength
Brand: ATS
4L80E 4L85E Transmission Boost Valve O-Ring Style Sonnax 34200-01K Featured Products Sonnax recommends bore sizing toolManufacturer 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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