Chris, thank you, the family loves the truck, the 4x4 was put in here in Utah by advanced4x4vans.com. Look them up they do a lot of different conversion vehicles. My NV has 4H, 4L, and 2H modes they put a different transfer case under it and I believe drive lines etc. their web page explains the parts used. They put the 20" wheels and nitro grappler tires, roof rack, ladder, and custom made running boards on it. I can try and get some pictures of the undercarriage but don't know how well they will let you see what's going on.