General Motors transmissions
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===Torque-Drive=== | ===Torque-Drive=== | ||
This was a low cost Powerglide-based transmission that used a manual valve body. It had to be manually shifted into high and down to low. It was sold under RPO MB1, and cost about $100 less than a Powerglide. It was available with 4 cylinder and 6 cylinder engines. | This was a low cost Powerglide-based transmission that used a manual valve body. It had to be manually shifted into high and down to low. It was sold under RPO MB1, and cost about $100 less than a Powerglide. It was available with 4 cylinder and 6 cylinder engines. | ||
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| + | ===Dynaflow=== | ||
| + | When you say Buick "Dynaflow", it's like saying "Chevy engine". Some still mistakenly refer to the early '60s aircooled Buick Dual Path- as well as ALL Buick trannys up until the Turbo Hydramatic came out, for that matter- as a "Dynaflow". | ||
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| + | There were a lot of iterations of the Dynaflow- beginning w/the early 1948-'49 version that acted something like a hydraulic version of a CVT tranny (it did have two "speeds", but selecting LOW would get you about 50 MPH, then you manually selected DRIVE). | ||
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| + | By about 1953 the "Dynaflow" was replaced by the "Twin Turbine Dynaflow", which then became the "Variable Pitch Dynaflow", around 1955. | ||
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| + | This was followed in 1958 by a triple turbine Dynaflow. There was another short lived tri-turbine AT, the "Turboglide" that was used by Chevy as an option in 1957 until about 1960, known as the Buick "Flight-Pitch" Dynaflow. It lasted until 1959. The different transmissions can be identified by the difference in the shift quadrants; Twin Turbines had a P-N-D-L-R pattern, Triple Turbines were P-R-N-D-G. In 1959 Buick dropped the “Dynaflow” name, the Variable Pitch Dynaflow became the “Twin Turbine”, the Flight Pitch Dynaflow was now called the “Triple Turbine”. | ||
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| + | 1961 saw the subcompact Buick Skylark/Special come along w/the “Dual Path Turbine Drive”, usually called the “Dual Path”. First gear was only about 1.6:1, so this was a bad design for acceleration if not for the car’s relatively decent power to weight ratio- at least w/the 4bbl V8 215 all aluminum engine- and the torque converter’s relatively high torque multiplication. | ||
==Three speed automatic== | ==Three speed automatic== | ||
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