Is there a code on the door jamb (or elsewhere) that can tell me what rear end gearing I have? I have this on my '05 F150 (along with the factory books to break the code(s) down); I've yet to buy the factory manuals for this '11 Mustang.

 

There is a tag on the axle housing with the ratio on it.

Not sure if there is anything in the VIN that tells the axle ratio.

There isn't anything specific on any door jamb sticker though.

 

There is a tag on the rear end and also there should be an option code you could match to the sticker on the drivers door jamb. Assuming its OEM installed.

 

Wow fail on my part to read prior post ...

 

^ what they said. just look at the axle housing you don't need to pick the car up, should be able to see it on the ground