I am about to start building a RCSB but can't find any concrete information on a couple of things that may seem like common sense to some, especially those who have done this project. I bought the truck from CL. $4500 99 4x4 manual f250 RCLB, I have tracked down a fuel tank from a short bed and should be picking it up Saturday. My question is what is the exact measurement for the cut on the frame and also, when I take my shaft to the driveline shop, what do I ask them to cut out of the driveshaft? There may be a thread in existance with this data, but after hours of searching I can't seem to find it. Any help would be appreciated. I would just measure the shortbed and cut accordingly, but I haven't found a suitable donor for under 2k at the moment. I will more than likely be shopping at salvage yards soon. I will post some pictures when I get a chance.