Depends on your mods. If you have plans on high power and want some sort of traction the stock gears are great, otherwise if you are stock for the most part a 3.73 wouldn't be a bad upgrade. I would never change out my 3.55's.

4.10's would be fun lol

Man Craig you have some big plans for that Shelby huh lol next thing I know you'll have a polished KB 2.8 under there.

Josh