COPIED FROM THE 6 TO 8 LUG CONVERSION TECH THREAD AND "MODIFIED" FOR YOUR SPECIFIC TASK....
Tools required to do this swap aren’t extravagant or complex. Most of your basic tools will get it done, but the most important tool to have, and if you don’t have it then don’t even bother starting this job is the Hub socket. It can be purchased from your local parts store, NAPA carries it, and even JC Whitney (who I bought mine from) carries the socket. Costs around $15 and it’s a necessity. You’ll need it in the future to repack your wheel bearings or to do a simple brake job anyway, so ya might as well get it.
1. Find a nice level area and park your rig with the parking brake on, or if ya don’t have one then put blocks in front and back of your rear wheels. Remember, Safety first…
2. Jack up the axle and put it on jack stands. Remove your wheels, then the calipers and secure them out of the way. Don’t just let them hang from the brake line, actually secure them as that could damage the brake lines.
3. Remove the locking hubs with an allen wrench, then use a small screw driver or pick to remove the inner and outer lock rings to get the inner splines out. Then use a couple of the allen bolts that held the locking hub in and screw them in so you can pull out the inner spline.
4. Now here’s where you grab your Hub Socket and take off the first lock nut. Remove the washer and the second lock nut and you can pull the rotor/hub assembly right off.
5. Take your rotors out to get them turned smooth (just like what you mentioned earlier in the thread)
6. Now you can install the hub onto the spindle. Put the outer bearing in and start threading the inner locknut. (inner locknut has a pin that points outward). Other than that, they look the same so don’t get them confused. There is a particular torque setting that is applied when you initially tighten up so you properly seat the bearings. You’ll have to consult your Haynes manual for it but I’ll give the general description. Tighten the first lock nut while spinning the wheel so the bearings seat properly, tighten till its snug (not too tight where the wheel wont turn anymore) but tight enough that the wheel starts to slow down a little bit after you spin it. Then the tricky part comes where you play "Line up the ducks" with the washer. You might have to tighten or loosen up the lock nut to align the pin with the washer but once you got that you’re set. Outer lock nut goes on and then you can put your locking hubs back on. Don’t forget the inner and outer lock rings (been there, don’t that)
7. Now all that’s left is the caliper. New pads would be a good idea as everything else is basically new.
It's the best I can do.