Re: 1967 Mustang rear end gear ratio
I didn't like the OEM 3.31 gears in my 1955 Thunderbird/w Fordomatic on the highway, and yes, I'm used to modern cars/w overdrive. I had 2.72 gears and an Auburn limited-slip differential installed in the Dana 44 rear end, swapped the Fordomatic for a C4, and installed the wide-ratio gear set. With 215/70R15 tires (26.9" diameter), I'm looking at approximately 2200 rpm at 65 mph-600 rpm lower than the 3.31 gears. Whatever you choose, make sure it's a good match for your camshaft and torque converter stall speed.
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