I think they would as long as you have an 8.8 rear end and the mustang has an 8.8 too. If you can get me the axle code on your drivers side door, Or the information on the axle tag on the axle I can help you out some more. Also I have never heard of a car with 2.73's that had limited slip unless the owner put in a posi them selfs. And just gears will not make your car have limited slip you have to have the actual posi unit and the gears.