Going to an engineer without a plan is pointless. You need to do your research, get a rough idea of a plan, and then take it to them. That engineer will have the yes or no answer.
ie: 4ag. Pug brakes, hilux calipers, pintara rear discs, t-series diff.
Or
1gg, hilux diff, kenworth brakes, john deere gearbox....
I suggest you spend about two weeks solid researching here, toymods, google, get your act together and things will be sooooo much smoother.