Eliminate hours of calibration time trying to convert generic 2004R valve body and governor combinations to high performance specifications. This OEM High output Buick Grand National valve body and governor assembly will provide wide open throttle upshifts between 5000 and 5400 rpm. Assembly includes a decked, washed and inspected valve body assembly ready to accept the shift kit and separator plate combination of your choice, providing shift scheduling required for high performance street and strip applications. Includes complete valve body assembly with manual valve, and governor assembly with ultra rare 10 tooth orange speedometer drive gear.