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I don't agree with the 500 miles diff oil change.
1500 miles is for the break in of the Axles CV joints.
Fine metal particles are found in any oil bath system. As long as the fine metal parts are smaller than the gap or the thickness of the oil films this is acceptable.
The transmission also has a lot of gears inside and nobody changes the ATF at 500 miles.
The "dirt" might be attributed to the Limided slip clutches wear. This material is compatible with gears and bearing and won't damage them. 45k interval sound reasonable for realtible cheap part that's easily replaceable.
I'd probably do mine at 20k or 25k with transmission flush.
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