What ring & pinion is this?

[ChickenJoe]

I just purchased an 86 GT. I pulled the diffy cover off to slide the axles out , so that I could install 3" studs. Figured I would ck the gear ratio while I was in there. The ring gear had 41 15 & 423 stamped on it. WTH??? I did some internet research & found nothing. Any ideas??

 

[wythors]

41 / 15 = 2.73

That's the basic Mustang gear ratio.

 

[Boosted92LX]

When ALL ELSE FAILS.... Count the teeth on each gear. Number of ring gear teeth divided by number of pinion teeth= ratio.