I have a 03 3500 dually and was thinking about getting super singles and changing out the gear ratio. was also looking into one of the new modules from superchips. does anyone know where to look for super single wheels and tires and how to find the gear ratio currently installed. after all this is done i believe that the economy of my truck should go up by 5-7

 

Are we talking HEMI or CTD?

 

cummins