Not Ranked
No Doubts, but...
Without doubt 400 lbft is enough to hold the wheel nut on it's center shaft.
Much of the reason for clips, wires and safety pins is to ensure some safety and retention if the nut does NOT get the 400 lbft required.
i would suggest cross drilling a single hole in the center shaft, outboard of the installed nut, either in the threads or just outside them (although the closer the better to the nut) and install a single safety pin or clip. Cheap, easy and effective.
Just in case things aren't quite perfect when you leave the pits...
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George Washington
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