Highway RPMs after Rear Gear Swap - Mustang Evolution

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Old 06-07-2010, 12:33 PM   #1
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Highway RPMs after Rear Gear Swap

I'm thinking about changing the gearing in my '95 V6er to either the 3.73 or the 4.10 7.5" to get a little more low end. My only concern is will it kill the ride at highway speeds? Currently when cruising down the highway in OD I'm at about 1200RPMs @ 55MPH, 1500 @ 65MPH and 1800 @ 75MPH. What can I expect at highway speeds with either the 3.73s or the 4.10s?

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Old 06-07-2010, 12:42 PM   #2
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re: Highway RPMs after Rear Gear Swap

I think 2.73 vs 3.73 is 25% more gear~ so expect 25% higher rpms (1800 at 75 will be around 2250)
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Old 06-07-2010, 06:33 PM   #3
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re: Highway RPMs after Rear Gear Swap

Found a great calculator at Gear Ratio Calc.

From the looks of it, going to the 4.10s would produce RPMs pretty close to what you would see with the 2.73s with OD turned off. Should still be fairly highway friendly. Time to stop thinking about it and just do it!
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