this company sells a good kit for putting power steering on these trucks, I ve read many good things about the product and their customer service:
REZ Engineering - No website yet, call or write - power steering kit. used trucks to part out(particularly 4x4). 1960 - 1966 Chevy/GMC. - PO Box 1584 - Great Falls, Montana 59405 - Ph. 406-727-9267
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I have not used them myself.
-W
