History
The Super Turbine 300 (Jetaway) was introduced for the 1964 model year as a replacement for the earlier Buick Dynaflow and Oldsmobile/Pontiac Roto Hydramatic transmissions. It was the only automatic offered on GM A platform cars (Buick Skylark, Oldsmobile Cutlass, and Pontiac Tempest) through 1966, and was available on the full-sized Buick LeSabre and Oldsmobile Jetstar 88/Delmont 88 as a less expensive alternative to the three-speed Turbo-Hydramatic.
From 1967-1969, the Super Turbine 300 was also available on the sporty Pontiac Firebird with the overhead cam in-line six-cylinder (230 and 250 cubic inches) or small V8 engines (326 and 350 cubic inches).
The Super Turbine 300 was discontinued entirely after the 1969 model year in favor of the TH400 and lighter TH350 Turbo-Hydramatic, the latter using the Super Turbine 300's tailhousing.
Super Turbine 300s were the first GM automatics to incorporate multi-case bellhousings (ST300s were bolted behind BOP powerplants along with the Chevrolet inline six) — which were later used with its successors — the THM350 and THM2004R overdrive.
Due to its two-speed with torque converter design, the Super Turbine 300 is often confused with Chevrolet's Powerglide — which was also a two-speed torque converter transmission, but the ST 300 was of a completely different design and shared no parts with the Chevy unit, which had been around since 1950.
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