will 35x12.5x17 tires fit in the wheel wells whithout modification also will this harm my fuel mileage. this truck has 285x75x17 tires stock and 4.56 rear end.thanks for your help.

 

35's are bigger than I could guarantee to fit. A lot of times they end up needing a lift. Gas mileage would probably be a little lower because of the bigger, heavier tire (see some of the other discussions in this forum on tire size). Anybody got 35's on an 05 Powerwagon with no mods?

 

the 35 inch tires will fit that truck with a leveling kit and will not rub i know someone that has it done and your milage will prolly get better due to your running gear is a 456 it would make your truck run like it had 410 rear end with the 35s so your milage might get a bit better the reason being is because your stock gear is very low in a power wagon.