gear ratio
looking for a way to lower the RPM at cruising speed by changing the stock differential gear ratio on my friends 1951 ford convertible. It's powered by a 302 with C4 auto trans with no overdrive. With the stock rear at 3.9 gear ratio it runs 3,000 RPM's at 50 miles an hour. He's not interested in quick starts just a smother ride at cruising speeds.
Is this something that can is done or can be done reasonably without going for a new transmission with overdrive?
Last edited by billfish; 03-26-2020 at 03:03 PM.
Reason: more information
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