I had a 67 with the three speed plus overdrive several years ago. The option was listed on the glovebox door, and as Longhorn Man said, it had 4:11 gears. It did get me as much as 21 MPG on the highway with a stock inline 6 engine, but I got greedy for power and got lazy and tired of shifting, so I swapped in a V8 and an automatic transmission.
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