hate to say not possible, but I have never seen a 3.31 in a first gen Z.
3.73 standard, 4.10 performance, and I THOUGHT 3.55 economy (there's a euphamism).
Several 4.56 around. Never seen a 3.31.
There is a chart somewhere showing what was available, but I can't find it right now.
To add to the confusion, there is very little dealer order info, as the Z/28 was a bit late to the dance in 67.
Can't imagine it being too fun to drive with a 3.31 rear.
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