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GM Saginaw 3 Speed Transmission Ratios

GM Saginaw transmission ratio is determined my the number of grooves machined on the input shaft on the front of the transmission.
TRANSMISSION 1ST 2ND 3RD
Saginaw 3-speed 1st 2nd 3rd
        No Lines (grooves)   2.85 1.68 1.00
        1 Line   2.54 1.50 1.00
        2 Lines 3.11 1.84 1.00
        3 Lines  3.50 1.89 1.00

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