Don't forget the ECM has to taken into consideration when you're swapping. You need to match the motor to your ECM or you need an ECM to match your new motor.
BTW the 2000 and newer do have plugs.
4" Teraflex long arm lift. D30 tubed with chromoly axles, high pinion, powertrax no-slip and Warn Lockout Hubs. D35 w/ultimate 35 upgrade OX locker, 4.56 gears. NP231HD, Air on Board, Warn M8000 Winch.