I have 3:73's in my B'cuda with 245/60-15's. I switched from the 3:23's that were in it while it had a 383/4spd. Seems like the perfect gear to me. Gives good low end grunt but ain't spinning the crap outta it at highway speeds....very drivable!! It now has a 470" in it(still 4spd) so it's lots of fun and still very highway friendly