You should take the hubs apart to see if there is any visible damage or wear first. I have oddball hubs on my truck too, they didn't function correctly at all. I disassembled them and they were in great condition, so I just washed them in mineral spirits, regreased them, and reassembled them. Now they work great and lock positively all the time and never do any funny business.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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