Welcome to DF.
This concept has been done before, but its not cheap or easy. You basically need a 2500 or 3500 suspension in the front to support the much heavier engine. You'll need an entire donor truck, as you will also need the tougher transmission and drivetrain to handle the torque of the diesel, not to mention wiring, sensors, etc. etc. etc.
I'm not saying you can't do it, just that it'd be far easier, and perhaps cheaper, to buy a 2nd gen diesel 2500.