If I am looking at the right gearing of your trans, a 2.87 1st and .68 5th, the 3.55 gear would put you at about 10.2 to 1 first gear ratio and a final of 2.41. If you already own the 3.73 gear, I would keep it, no need to waste money for such a small change. Otherwise, get the 3.55. It will give you a little better cruising RPM in overdrive.