the planetary gearbox and then shifted automatically. The Hydramatic transmission, a fully clutch-less automatic transmission, debuted in the 1940 model year. In 1939 four body styles were available: a business coupe with no rear seat, a club coupe with two rear fold-away jump seats, a two-door sedan with a full rear seat and a four-door sedan which shared its roofline with the two-door sedan. The wheelbase was 115 inches. The backs of the front seats were rounded and padded for protection of the rear seat occupants. A 216CID I6 was used. In 1940, the even larger C-body was introduced to Oldsmobile and it alone was powered by the straight-eight. In order to differentiate it from the previous year's Series 80 it was named the Series 90 (there was no Series 80 that year). The series were also given names for the first time that year with the Series 60, 70, and 90 being called the Special, Dynamic, and Custom Cruiser respectively. Two body styles were added to the model line up in 1940: a two-door convertible and a four-door station wagon with an optional wooden body showing 633 were manufactured and a listed retail price of US$1,042 ($ in dollars ). In addition, a full rear seat was added to the club coupe, although it still did not share the roofline of the somewhat roomier two-door sedan. A deluxe equipment package was also new that year. 1941–1948 In 1941 both engines were offered on each Oldsmobile series so to differentiate between the two the second digit was used to denote the number of cylinders, so the Special 60 was replaced with the Special 66 and 68'. The only way to get an eight-cylinder engine on the GM A body from 1941 to 1948 was to buy an Oldsmobile Special 68 or a Pontiac Deluxe Torpedo Eight. In 1941, the Series 60 wheelbase was increased to 119 in. Two models were produced, the 66 which used a 238 in3 (3.9 L) straight-six engine and the 68 which used a new 257CID (4.2 L) straight-eight. All Series 60s came with a three-speed column shift manual, or the optional four-speed Hydramatic automatic. Both options could be paired with either engine choice. Because of the column shift and new wider runningboard-less "torpedo" styling three passengers could now be accommodated comfortably in front. It used full instrumentation. In 1941 the lineup consisted of a three-passenger