12 bolt 6 lug

[Scottsbowtie]

Hey all, I have a 71 GMC that is a 2wd long box 3/4 ton. I'm turning it into a 2wd short box. I have a short frame as well as a short bed from another truck. I picked up a 12 bolt rear axle that is 6 lug, and has trailing arm brackets, so I know it came from a 2wd truck. I'm looking for some help on how to change to rear disc with an e-brake without spending a G. Anybody done a swap from something newer? Any ideas about rear suspension? Coils from something newer? Thanks in advance!