To do it correctly you will need to purchase the afore mentioned expensive conversion kit.
The other option is swapping a full axle and m/c.
I gotta ask though, what are you trying to gain.
Rear disc brakes give a perception of performance, but drums do a great job of stopping a vehicle, the $$ spent vs performance gained isn't a good trade.
J Cat and Aeroplane are right, it's expensive and drums work good, however if you're hell bent on doing it, Chevy Astrovans have disks all the way around and they swap over, there's a lot of step by steps online.
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