Sonnax highlights its solenoid test manifold kit (part no. 35430-VTK), which allows users to verify solenoid internal sealing integrity in ZF8HP45/55/70 and Chrysler 845RE transmissions.
According to Sonnax, the leading cause of solenoid failure in these units is an inability to maintain an internal mechanical seal, resulting in a multitude of drivability concerns. This kit allows pass/fail verification, which eliminates guesswork according to the company.