Greetings all. My uncle has a 1999 GMC Sierra 1-ton dually crew cab short bed truck with the 7.4L big-block. Oddly, this behemoth only came with something like a 23 gallon tank! From what I've been told, it can only get 150 miles or so per tank because the tank's so small, especially for that big motor. Will a factory tank that's bigger fit on the truck as a bolt-on? Something perhaps in the range of closer to 40 gallons? Oddly enough, the original windows sticker for this truck lists the fuel tank as something around 37 gallons, though the RPO codes and visual inspection confirm it to be the substantially smaller 23 gallon tank. Thanks for the help!