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Ratios
probably a 12 bolt olds rear was the original or 12 bolt chevy if it was Canadian car.
12 bolt olds 2.56 2.78 3.08 3.23
12 bolt chevy 2.56 2.73 3.08 3.31
Doubt it was anything steeper than that. ONLY the high performance versions of your car would have 3.42 3.73 3.55 3.90 etc.
12 bolt chevy rear look at the passenger axle tube between the spring perch and the center section casting on the front face of the tube.
there should be some letters and numbers stamped into the tube that will tell you the original ratio of that axle housing.... In the cast webbing of the differential you will find the date code the housing was cast also, letters and numbers again BUT cast into the housing NOT stamped.
example B 23 9 (Feb) 23rd 1969 cast housing.
example of axle tube stamping ccw 0230 B
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