I am thinking about buying this truck and I need some advice from you all on this setup. The truck is a 2005 KW W900L, C15 Cat 430 horse, 13 speed, 3.25 rears. What do you think about this setup as far as HP and mileage...I know, I know, it's a W900. Buy the way...I am pulling flatbed. I have to admit, I just don't understand all I know about horsepower and ratio's. I appreciate your advice. Thanks