Contact Matt at West Texas OffRoad. He can rebuild your box for $100 and I've heard nothing but good things about his work.
http://www.westtexasoffroad.homestead.com/
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1979 K-10 Silverado (work in progress)
1991 V1500 Subruban
1999 Suburban LT 4x4
2006 Suburban LTZ (daily driver)
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