Alot of people like the 373 gear, I had that in my old car and it was great,
if you do alot of highway driving maybe do a 355 but if it has the 410
in it give it a shot because Ive never had an automtic stang so I dont
know how the trans gearing will act. You can also go a taller tire size
in the rear to compensate a little. Personally I think 373 is the best all
around gear but I do like my 410s to