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Sounds like one of the axles was swapped out. I've never come across a factory install with different size studs. You will probably need to change the whole rear hub to get the bigger studs. The 18 is threads per inch.
Just looked them up...1/2 inch stud was 67-70.... 9/16 71-72
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69 GMC K10 ..some restoration required....still.. 
Last edited by Class of 69; 08-07-2003 at 10:50 PM.
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