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I found it on the floor after removing the axles and third member from my Road Runner. It is .0185 thick with about a 2 3/16 outside diameter. I am stumped as to what it could be for.
It is metal. The weird thing is that I had just replaced the axle bearings and seals when I rebuilt the rear end. Drove it about 100 miles. Had a howl in the rear, so I took it all apart again and that's when I noticed this on the floor under the passenger side. I suppose it could have come from something else, but I always sweep the floor up after a project is done.
It has a funny tab facing the ID. Never seen that before so probably not a bearing part. And at .018" thick that's not likely anyway. Wheel center cap is a good guess.