Diff center coming loose in housings

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Joined
Mar 11, 2007
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Anyone had trouble with their diff centers coming loose in their housings? I have heard of it in the 8'' HP diffs but I have 9.5'' LP front and rear and both are regularly coming loose in the housings? Think every second or third trip I am tightening them up. From left field it roughly coincidences with me fitting new wheels and tyres, could it be a harmonic from the tread pattern loosening them up?
 
Are the studs tight in the housings? If the studs are not set properly they can back out even if the nuts are properly torqued.
 
If they have been that busy I think I would check them.
 
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