I'll try to explain this a little better. Your truck has an electric AC fan behind the radiator an a mechanical clutch fan secured to the water pump pulley. When you remove the mechanical clutch fan, you are then relying on the electrical AC fan to cool your motor. The stock Hemi fan blade measures 19" and the V6 model fan measures 22". While many guys have had no issues using the stock Hemi Fan, the V6 model fan will cool the motor easier, and it has its own dedicated shroud with a mount for the upper radiator hose. Using the V6 fan clears up a lot of space under the hood by allowing you to get rid of the bulky stock fan shroud. On the 09-12 trucks, you can just remove the stock AC fan and plug in the V6 model fan. On the 2013+ trucks, the electrical connectors are different, so you have to use the motor from your stock Hemi AC fan and just bolt it up to the V6 fan blade and shroud. I do recommend a cooler thermostat and tuning to control the fan because you are now relying solely on this 1 electrical fan.