Well, I'm doing the dually coversion for my 2500. I can get a 1999 3500 4x4 4. 10 LS rear axle assembly with 31K miles for $1800. Figured this would be better than an arrowcraft assembly. Fenders are $595/pair. Wheels not sure yet. My question is this: What is involved with exchanging axles? Does the axle shaft screw on somehow? This is the only alternative for me as trading up is not an option for me. Thanks.