I've been interested in switching my 2004 supercharged x from 2wd to 4wd. According to most things I've read People say I will need a new transmission. I haven't looked under a first gen xterra that's 4x4, but wouldn't I just need a transfer case, rear drive shaft, front driveshaft/differential, and new hubs? It sounds like a lot but I am planning on getting everything from my local wrench-a-part. Any advice would be great.