42RE/42RH/46RE/46RH/47RE/47RH/48RE/A727/A904 Transmission Sonnax Manual Valve Symptoms: Converter bushing failure Delayed engagement Forward clutch drags in Park Cause: Chrysler rear-wheel-drive units do not charge the converter or cooler in park. Correction: Install this manual valve to allow the converter to charge in park. No valve body modifications are necessary. Only use if pressure regulator is 78 & later design In vehicles with Chrysler RWD transmissions, the manual valve does not allow the converter to be charged in park. This causes delayed engagement and converter bushing failure. Sonnax offers an upgraded, redesigned manual valve 22771-09 that allows converter charge in park. Upgraded, redesigned manual valve 22771-09 allows converter charge in park. Manual valve can be installed without valve body modification. NOTE: To prevent converter slippage, restricted cooler flow and possible hydraulic noise, remove the cooler line drainback valve. The Sonnax manual valve 22771-09 does not require valve body rework or adjustment and will not cause the forward clutch to drag in park.