Help with gear ratio please...


New Member
Oct 30, 2018
Hi everyone!
I've got a 2010 Mustang V6 base (5 speed manual) and I'm trying to figure out my rear gear ratio so I can get a new tune. The one I have now is throwing off my speedometer by +10 MPH. I thought that it had a 2.73 but that's not the case. On my door sticker all I have under "AXLE" is a "BG" code and I can't seem to find that anywhere. Should be a BB or something else? I can't really crawl under the car and spin my wheels to rotate the drive shaft and count so I'd appreciate it if someone could tell me what the BG code means. Appreciate the help, thanks. -David
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