Saving Granddad's Falcon

[dhbfaster]

Hello guys!
I finally got out for a nice drive, 34 miles or so and rolled over the 500 mile mark on the engine.
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Now I can finally stop using the break-in oil and change to 10w30. YaY! Plan to take care of that tomorrow.
On the drive though, it really seems like the driveline (pretty sure it?s the rear end) is both loosening up a bit (quite sloppy) and getting noisier. I was starting to get concerned.
Those of you who followed my thread ?back when? will recall that I rebuilt the rear axle myself (I felt way over my head on that...) with all new bearings, but kept the original ring and pinion that did have some pitting. So...looking for your thoughts...
1) Sloppiness...did I not shim the pinion tight enough?
2) The noise...is like a hum, seems to be getting a little louder than it was before, especially when I get up to 55mph or so. Would that be from the pitting that was there?
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Thoughts?