Blown Front Diff - Again After 110K

That chunk missing from the ring gear, that wasn't shock load IMO.

When the fracture is smooth like that, its been fracturing gradually over time until it just gets too thin and breaks off.

When a fracture is jagged and aggressive in appearance, that's a shock fracture.

Twisted axles, hard to say. Aggressive acceleration? Maybe the busted tooth worked its way into the spider gears and jammed them up, then when you turned it torqued up the axles.

Why's the oil residue look like mud?

 

I'd say it was very hot..
Side bearings are melted right out of it.
Axle shafts almost look like the were red at one point in the side bearing area.
Once the play in the side bearings developed the gear probably started loading near the tip of the tooth.

 

Was it a DuPont overhauled salvage yard diff.
As some of the other responses have addressed the oil must have looked like #### and things look like they might have been hot.
Do you know what the differential nest looks like. Possibly had some kind of seizure in there causing the posi feeling and the twisted axle shafts. Seems like the axle shaft would have had to be hot to twist like that and not brake but I guess melting the carrier bearings would do that. As far as the broken gear tooth it does look like it was a long time in the making.
I would be making some phone calls about where that power divider came from

 

Sorry about your luck op, just wanted to say i can smell the pictures through the internet and i dont like it

 

It did, look where the contact patch is on the teeth. I’d almost say the pinion depth may have been wrong when that was put together. Little wonder it broke one off. Looks like the gear oil is coked onto the housing, that thing was volcanic. Should have been able to smell that from across a parking lot.

 

Does this guarantee they actually physically checked your fluid level, NO.
So many times people count on techs to be competent and diligent.
Not all are. The guys that keep having "come-backs" aren't around long.
Looks like it was bone dry and deep fried.
Is it a stinky, smelly mess?
No, (or low,) Oil is at least a contributing factor.

 

That looks like it got hot as ####. Oil residue looks burnt, axle shows evidence of extreme heat.

No leaks doesnt mean its has proper lubrication... Id say it was very low on gear lube... For a very long time.