The only thing that jumps out at me right away is the drive shaft tube's are way too small in diameter. That and the transfer case and transmission don't look realistic. I don't think they had divorced transfer cases from the factory?
I could send you a .blend file if you want, that is all I have so far. None yet, still learning the jbeam format, I should be able to start work on this soon, I've already got some of the n/b designed. I had to model it from memory and I had some filler parts laying around, just figured I'd stick them in there to attract the "ooo shiny" crowd. It's mainly the reason I say it's only 25% done, If I wasn't going for accuracy, I'd say about 75% done but I want to get as much of it as accurate as I can,
Be quiet... people aren't very friendly towards sim-monsters around here. This is currently on hold for now. I have no way to update my game and I don't want to make it using an older version, I don't want to have to fix things if they get changed while I'm using an older version.