You have a 3/4 Ton 4wd Truck that has 102K miles on it....and you mentioned above that you Floor it and it Chokes Down Really Bad......Yet you stated that your Very Easy on your Truck and Never over about 2,500 RPM's??.....
What Engine....Gears.....Size Rims/Tires do you have on the truck Now??.....and what kind of maintenance have you done to the truck......like New Plugs/Wires....Filter's Air/Fuel??......and do you have any Performance Mods installed on the Truck.....CAI....Headers etc....