•  The 5R55S transmission has a gear type pump that supplies fluid under pressure to the hydraulic system.

•  The fluid pump provides the fluid pressure necessary to charge the torque converter, main control assembly, transmission cooling system, lubrication system and apply devices.

•  The torque converter impeller hub rotates the drive gear of the pump. The drive gear has an O-ring on its impeller hub contact surface.

•  The fluid pump has the following parts: