Iown a 02 1500 4.7 4x4. The truck has a lift on it already, it was on there when i bought it. I know it was made by pro comp but i am not sure of the size. I already have 35x12.50x18's mounted but am consideringa move to 37x13.50x22's. I am needign to know if they factory axles, drive shaft and gears are all i need to run this setup or shouldI be consdiering some serious upgrades. If so do you have suggestions as what I can to do for the right setup??