8 lug to 6 lug

[thompson1122]

I just bought a 1999 Silverado 2500 crew cab short bed with a 454 in it. I do not like the 8 lugs on it. The plan is to switch it to 6 lug and put in a set of newer 6 lug wheels. It is 2wd. I can just change out the spindles, rotors and calipers for the front. I want to put rear disc brakes on the rear. I think a guy used a rear axle out of 2004 Silverado and put it in the rear of his regular cab OBS. Was there a rear made with rear disc for my truck or do I buy a rear disc conversion kit or can I swap the rear axle from a newer 2000 and up model?