I have to give 2 thumbs up to the 4.10 gears. I just had them installed last week and what a difference.
To me, my Mach feels lighter and undoubtedly quicker. My biggest concern was the gas mileage, but this is not a problem @ all. I drive 100 miles a day and can usually get 285 miles out of a tank. I’ve been getting 275 since this install, but I've also been much heavier on the pedal.
IMHO the 4.10 are the best balance for a street car.
Tom