Your going to be better off in all ways just selling it and finding one w/ the 5.4 from the factory. All of the drivetrain behind the motor is different, and a different computer. By the time you factor in buying these parts and the time/labor installing them. You MAY be able to get the comp flashed to accept the 5.4, I don't know. You could bolt it to your existing drivetrain, but the 5.4 comes w/ a stronger tranny and most of the time a stronger rear. good luck whatever you do. It's not hard to find an ext. cab 5.4 for sale.