The Turboglide is a Chevrolet constant torque, continuously variable 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.