Just wanted to post my findings.. Changed front/rear diffs and the Alli spin on this past weekend. Alli magnet was real clean.. A little bit of fine dust but nice in the scheme of things.. Rear diff wasn't too bad, a few shavings but it was my second change. The front diff however was my first change and it had quite a bit of shards on it. I wouldn't say it was bad just more than I was expecting. Still, it's done now, Mobile 1 in and feeling better for changing it.. Truck has 5300 miles on her now. Anyone else with a 4x4 notice some collection on the front after the first change..?