Re: 1967 Mustang rear end gear ratio
My '68 with a 351W and C4 had a 3.90 rear. I ran tall 15" tires on it, 60 MPH was 3000 RPMs. I could burn the tires off it from a dead stop. I would say that anything from a 3.55 to 3.90 would make you happy.
The gas mileage with my car was still decent and I drove the car all over, state to state. A great car for getting somewhere fast.
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