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I don't know anyone that attempted it on a 04+ model truck, but to me.... manual hubs would not be worth a SAS.
You'll need a solid axle... at best $500
probably need to regear to match stock $300-600(if you do it or not)
then a custom suspension(4 link, or radius arms)
modified or new driveshaft, the list goes on.
Are you haveing trouble with the hubs? Why do you want to change them?