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In 1968, the GTO could be ordered with any of the following axle ratios:

2.56:1
2.78:1
2.93:1
3.08:1
3.23:1
3.36:1
3.55:1
3.90:1
4.33:1

If you have a 3.90, it will be stamped "WK" for an open rear end or "ZK" for a Limited Slip.
 
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