Dropping the tank is no big deal, the hardest part is getting the fuel lines disconnected, not much space for you hand. Mine was stopping at 1/4 full, and went empty on me, I had to learn to bleed the injectors in the middle of Baja! The specified ohm values for the 01 truck are incorrect in the shop manual. I got a new sender and it had the same values as my old one, way off from book, then ordered another one, which was the same again. So I cleaned everything, returned the new senders, put in my old one and added another fuel sender and guage as a backup. Has worked fine for over a year now. Do clean the screen on the bottom of the sender/pickup bucket. While you have the tank out clean the tank. Good luck!