The only disk-brake kit that I know of for the Eaton is thru Blackbird's Custom Trucks .
The thread that nu2-72 refered you to is all about the Corporate 14 bolt 73-up axle. 
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--Ben
71 GMC Suburban 4X4
The "Beast"
388 CID Stroker, TH350, NP205, 8-lug D44, 14BFF w/ Detroit, 4.10:1 gears, 4-Wheel Disks 4" Lift, 35" MT/R's.
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