Ok so I noticed this morning that I had lost a lug nut, and on closer inspection it turns out that the stud is just GONE. So, I'm assuming that im going to need to pull that axle shaft and replace them somehow, is this a hard task? About how much would it cost and where can you get the parts? Anything else I should know, and would this be a good time to do a rear disc brake conversion? Also, this is on the drivers side rear. Thanks for any help in advance.