So my center diff case melted where the planetary gears press against the inner wall.

It clearly let go during an acceleration pass where the front end lifted and front wheels were off the ground, causing "over drive" to the front. So the center diff was working very hard at failure.

Upon disassembly, there were lots of "plastic chunks in the slurry. I'm guessing the diff oil leaked over maybe 25 runs, as it was not full.

So
How many have had this kind of failure?
Is there a recommended disassemble and inspect interval?

Other comments?