K 1500 Suburban 4WD V8-5.7L VIN R (1997)
The purpose of this bulletin is to identify the correct oil pump rotor (212) and slide (203) usage for the two different transmission oil pump designs.
Manufacturing of the first design oil pump rotor (212) and slide (203) ended November 30, 2000.
Manufacturing of the second design oil pump rotor (212) and slide (203) began December 1, 2000.
Important:
It is critical that the first and second design oil pump rotors and slides do not become intermixed. Do not use first design pump components with
second design pump components. If the pump components from either design are intermixed, pump efficiency will be affected resulting in less than
optimal pump performance.
The first design oil pump rotor (212) and slide (203) DO NOT have any identification markings.
