Changing Axle Ratio from 3.73 to 4.10 and GCWR

I'm looking to get a used 2004-2007 Dodge Ram 3500 truck. The specs I've found for 2004-2007 Ram 3500 Quad Cab 4WD LB DRW: 3.73 axle ratio = 21,000 (GCWR) 13,350 (max trailer) 4.10 axle ratio = 2...