hey there! can you remove hte tag on your diff cover oneof two tags tell you the gear ratio and wether its a limited slip or an open carrier usually for a gt mustang would be 3.73 ratio but it changes if automatic or standard trans,....
it has an 8.8 rear end with a 3.23 ratio.
The gear ratio in the 1979 Ford Mustang turbo four is 3.45:1
I believe that is 2.73 ( axle code " M " )
The gear ratio for the 1979 Mustang V8 is 2.47:1
the stock Toyota gear ratio is 4.11
i believe it would be 3.11
The axle ratio on a 1998 Mustang Cobra is 3.27:1
3:31
The axle ratio on a 2007 Ford Mustang GT is 3.55:1
The stock rear-end gear ratio for all US 240sx is 4.083
2.73
3.23 would be stock.