Q: Can you swap out a 6L deisel in a F 350 2006 for a 6.2L gas

There are a couple issues but the usual deal killer is the incompatibility of the engine computers. Your existing engine computer is mapped to run a particular engine and unless every sensor output from the existing engine has identical scaling, magnitudes and so forth, you could get a result ranging from the new engine won’t even run to one where it runs poorly. Of course, it is impractical to re-wire the vehicle and change the engine computer, not to mention the transmission control module, and it is basically for this reason that these swaps are impractical. The other issues are the accessory mounts and engine mounts all have to be identical in order that everything lines up and for the existing wiring harness to work. Finally, if there is a change in weight that would affect the suspension settings, alignment and so forth. It can be done, but at minimum you have to carry over the engine computer and/or confirm that your existing computer could possibly be re-programmed to accommodate a different displacement engine. If you have other concerns or questions, by all means let us know.