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If I did my calculations correctly, running a 2.73 rear gear with these tires (25” diameter) should have basically the same effective gear ratio as a 1970 GTO 455 4 speed close ratio with 3.36 gears and G78-14 (26.7”) tires, which I believe was factory; would have.
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He's doing a comparative with standard factory equipment of a 70 GTO 455 4spd car , and its basic issue tire. To get a feel of where his drive ratios will land alongside an approved package.
Is why he used that tire size.
Small note is the 70 would have had a 12bolt 3.31 , not a 3.36
Just hoping your 2.73 is a posi
If not you might better include a rev limiter