3.55 ?

I have the 3.21's in mine...but I had the 3.55's in the RoadRunner..fro cruising and miles per gallon go with the 3.23'a but for decent mpg+ some more ummph off the line through the gears the 3.55's are hard to beat..they are my favorite gears! When I redo my rear 3.55's are going in,,they cruise on the highway/around town just fine. 3.23's are just fine also ...3.55's are just a bit more fun :)..when you start getting into the 3.91 and up thats more(IMO only of course) a street/ strip gear.