MagHytec diff discoveries

[Bluebird]

Diff Dip stick had some black 1/2" on end, oil clear on remainder of full-diff content. Should I be concerned, change oil? Truck only a weekend warrior now. Blessings to All, Patrick

 

[Joseph Donnelly]

The dipstick has a magnetic tip and it picked up some powdered iron from wear. If concerned, open the drain plug, inspect that magnet to see if it picked up a lot of iron. New fluid can't hurt anyway, even if you don't see a reason to remove the cover.