I am swaping my 3.9 out with 5.9 once it go's. I was told by a mechanic its the same motor with just 2 cylinders hacked off. It will bolt right and the transmisson will work with it he recommended a trans go shift kit. You'll need a v8 computer and 2 more injector wires since the v6's only have 6. Hope that helped. :banana2:
Just finished swapping a 4.7 for the wimpy 3.9 WOW!!!
Mine is a 2000 3.9 QC Sport 4X4 donor was a 2000 4.7 SLT. Pulled the engine, trans and wireharnesses out of donor in a day. You will need both front harnesses and control boxes, heaters hoses, AC lines, throttle, cruise and shift cables. Everything bolts right up and the transmission crossmember can be resused, just turn it around. Gain 60 HP, MUCH better fuel milage and a totally different truck. :mullet: