The variable force solenoids control clutch apply/release, torque converter clutch apply/release and line pressure. The priming valve insures proper flow and pressure to the solenoids, and is especially crucial during hot conditions and low pressure. Low solenoid feed pressure at idle can create delayed engagement or wrong gear starts. This priming valve also limits the maximum pressure to all the solenoids. Excessive solenoid feed pressure can flood the solenoids causing gear ratio codes, harsh up/down shifts and excessive line pressure. Reconditioning the bore and installing Sonnax oversized priming valve kit 35740-21K eliminates bore wear and stops leakage for proper solenoid pressure control.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
October 17, 2016
Topics: Transmission Report Newsletters Transmission ZF ZF8HP70 Transmission ZF8HP45 TransmissionRead Now
December 07, 2016
Topics: Vacuum Test Guides Vacuum Testing Transmission ZF ZF8HP70 Transmission ZF8HP45 TransmissionRead Now
August 11, 2016
Topics: Webinars Transmission ZF ZF8HP70 Transmission ZF8HP55 Transmission ZF8HP45 TransmissionWatch Now
Contact a Sonnax Parts Distributor.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.