Digit 9&10 in your engine serial number (assuming original engine): vettefacts.com
  • CQ: Three-speed manual transmission
  • CR: Three-speed manual transmission with fuel injection
  • CS: Three-speed manual transmission, high lift camshaft, and fuel injection
  • CT: Three-speed manual transmission and dual four-barrel carburetors
  • CU: Three-speed manual transmission, high-lift camshaft and dual four-barrel carburetors
  • DG: Powerglide automatic transmission
  • DH: Powerglide automatic transmission and fuel injection
  • DJ: Powerglide automatic transmission and dual four-barrel carburetors

Cars with optional four-speed manual transmissions used the same engine code suffixes as cars with three-speed manual transmissions. The body number plate is located on the engine side of the cowl. Fisher Body Style Number 59-867 identifies a Corvette.

T
 
saginaw 3 speed was the base transmission , april 1957 the four speed was released in option until 1962, 1963 was the introduction of the muncie M20 4 speed.
 
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