Ralleye Center Cap Noise

I had a rim make funny noises after I changed wheels studs. The jobber wheel studs had a longer spline/shank and stuck out of the axles slightly more. The (aftermarket) rim tightened down on to the shank of the wheel stud instead of the drum and axle flange. The popping sound was the drum which was not clamped down between the rim and the axle flange. Maybe this is your problem..