What kind of mods do you have or plan to have? If your plans include mods to raise the power band, get the 3.73s. If your mostly stock I would get 3.55s. You will get lots of mixed responses to this but the fact is a stock 5.0 falls off over 5k rpm, so the 3.55s will keep it in its powerband a little longer. You should find the debate thread and read it.
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more!