OK, my 87 300E is at it again. 1 1/2 years ago I replaced the left rear bearing. It needed it. When the tire was jacked up you could really feel the play in the bearing. Now the rear wheel is grinding and graunching again. I jack up the offending wheel and grab the tire to test for play...there isn't any. It's solid. I test the passenger side, it's solid too. So I don't know what to think anymore. Could it be brake pads? Or differential mounts/bushings? Any ideas you have would be great. Thanks in advance.

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1987 300E
1967 Jaguar E-type Series I, 2+2