I dont know anything about gearing. I have a 2001 f150 with the 4x4 package, and i want to put 35.5"x12.5" tires on. The sticker on the door says my axle code is H9, so i think its a 3.55 but not sure. The truck will be a daily driver, not to much hauling right now and no towing, just driving around town and highway. The only off roading i do is on the beach (not overly strenuous). Do i need to regear? If i do can i put it off for a little bit to save the money? Im thinking about getting the edge tunner, will that help anything at all. Is there anything else i should think about getting. Thanks for the help.

 

Go lower on the gears for sure! It will keep your gas mileage from going to crap and keep your RPM's where they need to by on the highway. I would go to a 4.10 atleast. Maybe a 4.56

 

I have 4.30's and 33's. Its perfect