Yes, that is just a corporate 12 bolt rear end. You can have a posi installed (what i'm doing). GMC Pauls sells a disc brake kit for this rearend.
12 bolts are known to be a very good rear end and I would definately have it rebuilt before going and getting another.
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Brian Pal
1971 Cheyenne 10 454/th400-Undergoing a full frame off resto.
1972 Chevy short/step 2wd, 350/th350
1983 M1009 CUCV Military K5 Blazer
1981 Dodge 1 ton 4x4 dually flatbed
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