for a 5 speed street car 4.10s are a bit much, but for the auto is responds better with 4.10s then with 3.73s. I just put a few highway miles on the gears and they do not seem to rev too much higher.
Generally, 4.10s are what are recommended for auto while 3.73s are recommended for stick on a street car.
2003 Redfire V6,
Show: Smoked everything, cobra front bumper, gt rear bumper, rear decklid and lower valence blackout with black mustang letters, 5% rear front 15%, black 98 Cobra rims front, 95 Cobra R rear black with chrome lip, black scoops and spoiler and exhaust tips
Go: CAI, True Duals with flowmaster super 44's, Bama Tune, full suspension (lowered, 8.8, 4.10s, UCA, LCA, springs, CC plates)