Jim
Ron is absolutely on the money with the threadlocker. I have a friend who recently bought a 1970 chevelle, completely restored, and setup as a drag car tubbed, 9" ford rear , etc. etc..
Whoever installed the studs (screw in type) decided to tack weld the head to the back of the axle flange to keep them from backing out. Well, first time at the local drag strip and all 5 studs on one side sheared off at the starting line....probably from the brittle spot created from welding. I would be willing to bet that he would have had a better day with Locktite.
Cheers
Phil