The code is on the front side of the passenger side axle tube, a few inches from the differential housing. A wire brush may be required to make the code visible. You will have one of the following:
PX for 3:23
PW for 3.08
PT for 2.56
PS for 2.41
If you pull the differential cover, the pinion gear will have two numbers stamped into it. This is the tooth count of the ring and gear set. If you divide the higher number by the lower number, you will have your exact ratio.
If your car has the W72 engine package, you have 3:23 gears unless they were changed at some point.
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