Sonnax 34910-03K Transmission Pressure Regulator Valve Kit TH400 3L80 71-98

Brand: SonnaxOther Part Number: S34507PKType: Pump ComponentItems Included: Pressure RegulatorManufacturer Part Number: 34910-03KMaterial: SteelUniversal Fitment: YesVintage Part: NoPerformance Part: Yes 400, 425 Pressure Regulator Valve KitPart No. 34910-03K Fits '71–later units. High-mileage vehicles with a GM 400 and 425 units often experience poor line pressure control due to a worn pressure regulator bore. This will result in high cooler pressure and converter, crankshaft and/or friction element failure. This bore wear can be verified by testing line pressure and testing the pump. This hardened steel valve continuously oscillates within the cast-iron pump bore, resulting in wear. Balance line pressure is then allowed to leak past the valve and exhaust to the sump. This prevents the pressure regulator valve from moving completely to the lower line pressure position. Sonnax pressure regulator valve kit 34910-03K eliminates these problems.