![]() ![]() The ST300 has a complex multi-angle torque converter and front and rear clutch packs. This 2-speed transmission was slotted into various models in the Buick, Oldsmobile, and Pontiac lines. The transmission was mated to the 215 inline six (I6) and the 326 and 389 V-8s in the General Motors A- and B-Body cars. The sole automatic transmission choice was an upgraded version of the 2-speed Super Turbine 300 that was available in the Tempest and LeMans series. The clutch assembly was housed in an aluminum bellhousing, which also mounted the transmission. (There has been speculation as to whether the close-ratio 4-speed was actually installed in any 1964 GTOs, even though it is listed as available.) All manual transmissions used a 10.4-inch clutch featuring a single dry-friction plate, bent-finger diaphragm spring, and a 2,350-pound spring-loaded pressure plate. When the GTO arrived in 1964, three manual transmissions were available: the standard Muncie 3-speed manual, an optional wide-ratio Muncie M-20 4-speed, and a close-ratio Muncie M-21 4-speed available only with 3.90:1 gears installed at the factory or with dealer-installed 4.33:1 gears. You can copy and paste this link to share: SHARE THIS ARTICLE: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. For a comprehensive guide on this entire subject you can visit this link: LEARN MORE ABOUT THIS BOOK HERE This Tech Tip is From the Full Book, HOW TO BUILD MAX-PERFORMANCE PONTIAC V-8S. In addition to 3- and 4-speed manual transmissions, Pontiac also offered 2- and 3-speed automatic transmissions. Transmissions were sourced from Muncie, Saginaw, GM’s Hydra-Matic Division, and even Dearborn (Ford). Pontiac’s transmission offerings for 1964–1974 GTOs were similar to the transmissions offered in other Pontiac and GM models. ![]()
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