If you ever wondered what gears your car has stock. Look at the door tag inside the driver side door. this applies only to the 86-95 5.0
Where it says AX on the far right on the bottom it will say 1 of the following 3 letters. M,Z and E.
Obviously your door tag has to be intact to beable to get the info this way.
Hope this helps some people that always wondered what rear gear ratio there car originally came with or still currently have.
If you dont have either of those, jack up the car, mark a line on the rear tire it dose not matter which side, then make a mark on the driveshaft, rotate the tire one full turn while counting how many times the driveshaft goes around.