I didn't regear mine. But it came stock with 3.55's so it's ok. Been running it like that for a year. But once my Mustang is done I'm gonna buy a 4.11 ring and pinion and put new clutches in the rear. And I already have a 4.11 set for the front.
I mean I could run 4.10's no problem. But then I lose all hopes of having decent MPG's. I currently average 17-19 in town and around 20-22 on the interstate.