with just a programmer an 04.5 + truck will run mid 13's if you can shift it fast enough.
it's not just dumping the clutch in 2nd gear - doing that in 4x4 will ruin a stock clutch. You have to rev to around 3 and than release the clutch - don't drop it. As soon as it starts to grab, let it out as fast as you can push the go pedal to the floor. Don't slam the pedal or you'll kill the clutch but don't drop the clutch or you bog the motor.
release it as fast as the motor will make boost at 2000-2200 rpm, which is where you'll be in 2nd gear when the clutch is all the way out. You can practice in 2wd until you have the tires busting loose as soon as the clutch is out, which is when i power shift 3rd and blow the tires away for another 100 feet. When you obtain this effect your ready for 4x4 launches, than get ready to replace that clutch!