i just finished the swap way way easy and i swaped out a 22re for a 3.4 out of a 2 wheel drive auto 4runner. you need a ecu from the same year vehicle as the 3.4 with a manual it can be 2x4 or 4x4 it dont matter. you will need the bellhousing to block brackets off your 3.0 along with the plate between the engine and tranny. you do need to check for a pilot brg hole in the crank. the starter from the automatic will work if you use the 3.4 flywheel and clutch. all i bought from ors was the harness was a 5 wire hookup very nice harness you dont need the ors battery harness you can make one for about $20. if you have any specific questions i may be able to help. there is a few good writeups on 4x4 wire and yotatech and i think there is a few on pirate. i have the links saved if you would like them. it is a very easy swap.