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Treblig, My Shell Valley came with a narrowed 9" and we felt it had movement also. After looking at the 4 link we could not locate a problem . We start to think it was a problem with the locker and we started to remove the axles to have alook. We could not remove the axles ??? they would not come out . After hours of pulling we drove the axles out we found that the flanges at the ends where welded at an angle and could be seen with the naked eye. The bearing where beat into the opening and where cracked in two places . Yes Shell Valley did the welding . I removed the rear end and took it to a specialists and he could believe it . You could not put the axle aliment tool in to the mouth of the housing end it was so far off. It was working on the axle like a lathe and it torn up the bearing and the housing . I purchased another 9" and had it cut down to fit . I hope you do not find this but another Shell Valley owner in Washington State did.