you might find a 3.7 to be a bit long.........
I ran a 3.6 in my old S2 RX7 for a while (before changing back to 3.9), but it was waaaaaaaaaaayyyyyy to long. I'm talking 80 in first, 120 in second, 3rd was...............
i think a 3.9 would be better if your looking for a taller ratio, altho i don't know why you really want to change it. I loved the 4.1 in my RX7.
IMO 4.1 is perfect for an NA car