First appearing in the 1963 Chevrolet full-size cars and Corvettes, they were originally available with two first-gear ratios, 2.20:1 and 2.56:1.As GM phased out use of the Borg-Warner T-10 in 1963, the 2.56:1 ratio became standard equipment for 4-speed applications in the 1964 Chevelle, Nova and Olds F-85/Cutlass. These early units went through design changes in their youth, …
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