Truck reached 50,000 so I figured might as well start draining fluids and check things out. I drained and refilled Rear & Front Diff, Transfer Case, Power steering fluid, Brake Fluid, Dropped Tranny pan put new filter in and flushed ATF through cooler lines. Although I know the material is considered normal gathered on the magnets at all these locations--I was shocked by the amount collected on the front diff, transmission, and transfer case (no big pieces just ALOT of "normal" fine particles. Makes me kinda wish I had done it alittle earlier. I ordered a Magnefine Filter to install in the transmission cooler line to catch some of this between changes.