Wikipedia
Turboglide
The Turboglide is a Chevrolet constant torque 3-speed automatic transmission that made its debut as an optional transmission on Chevrolet V8 passenger cars for 1957. It consisted of a concurrently geared (as opposed to sequentially geared) planetary gearbox with a 'switch pitch' dual-pitch torque converter stator. Turboglide utilized a die-cast aluminum transmission case, following Packard's Ultramatic of 1956. It was designed to help showcase the engineering features of the ' 57 Chevy, and was often ordered with the Rochester RamJet Fuel Injection system on the 283 V8. Turboglide cost about $50 more than Powerglide, and was available in all 1957-1961 V8 engine models except the Corvette.