Mine is kind of a little bit of a mixed bag of a powertrain.
A dash of Explorer, a pinch of third gen, a tad '04 F-150, a heavy chunk 1970's truck and scoop of some misc 1980's car...
Interior and body stuff still sucks to track down. I finally found a nice set of arm rests that were not white or broken. I still haven't found a nice box or a truck to harvest cab corners from yet.
I do have a good stash of mediocre armrests. I stash what I can find because in a few years I think stuff is going to be hard to come by.