I'm looking to swap my 4.7l engine with either a cummins engine or a SRT 10 engine my question is what year of cummins engine would I be able to put in there im lookin to get the biggest one there is so if any one can help thanks

 

No matter which one you chose, you are going to need to replace engine mounts, PCM, wiring harness, trans, and a host of other little parts. Your best bet would be finding a parts donor truck, and buying the whole truck........ It isn't going to be a simple drop in, and go.... Lots of work, and a fair bit of fabrication as well.