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A Switch Pitch can be identified outside the vehicle (with the torque converter removed) by a narrow front pump spline. Note: GM had also used a Switch Pitch in the 1955–1963 Buick twin-turbine Dynaflow and the 1964-1967 two-speed Super Turbine 300 used in Buick and Oldsmobile (Pontiac's ST300 didn't get the SP). Vehicles originally equipped ...
One feature of the Dynaflow, the variable-pitch torque converter stator, colloquially the "Switch-Pitch", lived on in versions of the Turbo-Hydramatic (Super Turbine 400) fitted to full-size Buicks, full-size Oldsmobiles and Cadillacs built from 1965 to 1967, as well as the Buick Super Turbine 300 and Oldsmobile Jetaway from 1964 to 1967.
1956-1957 Twin Turbine 2 Dynaflow: the 2nd redesign w/ 2 turbines & variable-pitch stator. ... 1972–1976 TH375 — Light duty version of TH400; 1976–1987 TH200 ...
From 1964-1967, Buick and Oldsmobile versions of this transmission used a torque converter with a variable-pitch stator called Switch-Pitch (by Buick) or Variable Vane (by Oldsmobile). The stator blades moved from high to low position by an electrical solenoid and a stator valve , controlled by a switch on the throttle linkage.
The standard transmission was a three-speed manual with column shift and the two-speed Jetaway automatic with switch-pitch torque converter was optional. Hurst shifters became standard equipment with floor-mounted manual transmissions including the optional heavy-duty three-speed, M-20 wide-ratio four-speed or M-21 close-ratio four-speed.
The Super Turbine 400 transmission now had a variable pitch torque converter, but was fitted with a three-speed gear selector. The Gran Sport stock dual exhaust pipes were increased from 2.0 inches (51 mm) to 2.25 inches (57 mm) inside diameter and had fewer turns to reduce backpressure.