I have a 2001 V6 Mustang...i bought it used and i am not sure what kind of gears it has. The guy who sold it to me won't answer his phone and i don't want to buy 3.73 gears if it already has it. What can i do to figure this out?

Thanks

 

I doubt anything more than 3.27's are in there.
Anyway, if it isn't printed on the tags on the diff cover (not sure if Ford prints that there), lift the rear end up, put the car in neutral, and turn the tires and count how many times the driveshaft rotates w/ 1 rotation of the wheel.