[mykeboz]

I am aware that my V6 did not come with the ability to spin both tires, yet mine does. This means it has had a T-lock installed if i am correct, and would it not be more common than not for my mustang to have 3.73 or 4.10 gears with the T-lock than it having the stock gears still in place. How do I find out what gears I do have?

[Duel Mustangs]

Lift the rear of the car and spin the back tires one full turn while counting the turns of the drive shaft.
Example, if you have a 3.73 ratio your drive shaft will spin 3 and 3/4 turns for each one full turn of the rear tires.