Editing General Motors transmissions (section)
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====SP 300==== These were found in 1964-'67 and were two-speed. The SP 300 converters are 12". Olds called it the '''Jetaway''', aka the '''Super Turbine 300'''. The ST300 had a three element torque converter, a front and rear multiple disc clutch pack, and a compound planetary gearset with a front band and a clutch pack for reverse and manual low gear. The unit was cooled with a small auxiliary ATF cooler located beneath the engine radiator. It had an aluminum case and weighed 152 lb. It was designed to start in low gear, providing a gear ratio of 1.765:1 plus the additional torque multiplication provided by the torque converter. The shift pattern was P-R-N-D-L. In Drive at full throttle, it would upshift from low gear to high gear at 60–65 mph. From 1964-'67, Buick and Olds versions of this transmission used a torque converter with a variable-pitch stator called Switch Pitch by Buick and Variable Vane by Olds. The stator blades changed pitch by an electrical solenoid and a stator valve, controlled by a switch on the throttle linkage. At light to medium throttle, the stator blades were at 32°, providing a torque multiplication of 1.8:1 and a converter stall speed of approximately 1800 rpm. At ⅔ to full throttle, the blades switched to the 51° high stall position, giving torque multiplication of 2.45:1 and a stall speed of approximately 2300 rpm. The blades were also set to the high position at idle to limit creep when stopped in Drive. The variable pitch stator was eliminated after 1967. This feature was not used on the Pontiac versions of this transmission.
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