When was the change to rear disc?

How hard is it to swap the axle from one with drums to one with discs? do you need to swap brake lines?? I just scored a dana 70 with discs for cheap... I am jumping on it, as my ring and pinion is shot in my Dana 80, and the drums to little to nothing to stop my 9,000 lb Baja Outlaw boat..

What kinda price you get?
Is this Chris?
 
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