Tberg725

My cousin recently bought a 2008 mustang just wonder what the stock gear ratio is and what size rear end is in it, thanks.

Mock01

Assuming that he bought it new (or that the previous owner hasn't changed anything, if he bought it used)...If it's a V6, then he has the 7.5 rear end and I believe 3.31 gears. If it's a GT then he has the 8.8 rear end and either 3.31 gears or 3.55 (Package option, isn't it?)

tx_zstang

Yup, Mock01 you're correct.
Most likely is 3.31's.

mustangman02232

7.5" 3.31, open diff