Just got my first pony

[Hammer]

When you say 3.73 gears, does that ratio refer to a gear in the differential? Or somthing in the gearbox?

It refers to the differential.

The FAQ mentioned somthing about not choosing this ratio if you don't plan on making any engine mods. At the moment I don't. Is this still a good idea?

There will be debates until the end of time about the best gears for a modular street-stang... just do a thread search on gears and you'll find out.

I personally find 3.73s are the best gear for a daily driver street stang. Others swear by 4.10s....

Could there be somthing wrong with it? It sounds great and seems to run smooth, but since this my first mustang, I cant compare with anything.

A modular Mustang's power is not made down low. Even though you don't feel it, I bet the stang would beat your mom's Saturn by 3 seconds in the quarter. It's deceived many a driver...

Get the right gear ratio and a short shifter. You'll be fine...