I did just that a few days ago. I have an 84 K-20. Replaced auto hubs w/ man warn hubs. I went with the heavier duty ones. I go to the mountains often and just leave them locked while up there. I have done the same thing for years with my ranger (warn man hubs), and never a problem.
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84 K-20 Burb
94 Ranger 4X4
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