I've ran both gears in my street Mustangs over the years and 3.73's are in my opinion, the way to go. You'll see around 2450 rpms @ 75mph on the highway with a 5 speed and 275-45-15 tires. If you have your heart set on going with 3.55's I have two new sets of Ford Motorsport gears for an 8.8that I will ship to you for $140. Please PM me if I can help you out...
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