Late to the party, but I'll add: Car has a 9-1/2" converter. Been running 3.91's and 255/60's (27") for a few years. Last year I did the NWDT, drove it to a few hundred miles on the freeway. Not too bad; about 3150 at 65 MPH. This year I've gone to 4.10's. Street driven plenty. I dig the deep gears, but admit I'd love to add a gear-vendors OD.