Does all the 4wd stuff just bolt in the 2wd frame?

I have a good 01 R/T but a canadian abandoned it here and so I can't get a title. I can buy a real nice 2wd 01 with a blowed up 4.7 and I know I can switch the motor/trans stuff out but what about the front diff stuff? I just want to switch all the R/T 4wd drivetrain stuff onto the one with a title if it is not too hard.