front differential emptying itself threw the overflow?

[SmokeyJoe]

Overfilled is my only guess.

[H2duramax]

Problem solved, I talked to the diesel mechanic who works on on my 7.3 and he checked searched the gm service advisories, it said that some of the overflows were mounted to low and the overflow valve itself could be replaced with a filter. So he ordered the kit for me ( like $50 dollars ) and I put it in that afternoon. No more leak.