How to Find rear Gear Ratio??

[gooch06]

I have a 1990 Mustang LX 5.0 5 Speed and the door tag is missing. I'm trying to find out what rear gear i have in the car. How do you find that out??

 

[65ShelbyClone]

Jack it up and in neutral have someone slowly rotate the back tire exactly one turn. Your job is to count how many times the driveshaft spins. 2.75 turns = 2.73 gears, 3 turns = 3.08s, etc.

 

[Car RamRod]

yea what he said.