I believe you still need to swap the trans, plus computer, harness, etc. For the amount of effort involved i would at least swap in a 4.0. Although with the 4 cylinder you're getting decent gas mileage.
Keep your eyes and ears peeled, look outside of your general area, tell your friends and family that you're looking for one. You do the mechanical work, that keeps the cost way down.
Good luck with that....
New to buying used vehicles?
$2500 seller is a jackass thinking he can get $6k for a beat up work truck.
Don't buy from flippers. The buy stuff at prices you should be buying and then do some "fixes" and try to sell it for at least double what they paid.
They also did it on an episode of trucks years ago, try to find that episode.
Try googling as well