Ok folks, I've got a 2000 F-150 XLT that has a 4.2 L engine that won't pull my big bass boat. Can I get the 5.4 L engine out of my dad's wrecked 1999 Lariat and slap this bigger engine in it or will I have to get the trans, computer and rear end all moved to give me a truck with enough power ? Should I just trade for a newer v-8 ?
Of course this swap is possible, but practical is another question.
You are talking the engine and trans at least. Rear axle would be a question. Driveshaft work is probable.
Computer and wiring harness also must come over. Then you have to make sure it all works with gauges, controls, cooling, exhaust, linkages etc.
Does the 4.2 truck run and drive ok? If so, sell it and buy a later V8 equipped as you like and need. You may or may not be money ahead, but you will be time and reliability ahead. You can get more money, but you cain't buy more time.