I bought a 1970 Chevelle SS396 when I came home from Vietnam in early 1971. It had a 4-spd and the 3.73 posi. I can't tell you the build date of the car or the axle code because it wasn't important at the time. It does seem that at least a few were built with that ratio.
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Robert
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1969 Chevelle SS396 L78 M21 4.10
2023 Stingray Coupe Z51
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