Diff noisy, you say?

12 F150, 9 3/4 rear diff.

Never seen broken races before.

One side bearing:

The inner races, also broken, but the other way:

And, for good measure, the front pinion bearing:

And, the rear pinion bearing wasn't actually too bad.

I've seen lots of bad bearings, but never cracked races.  Upside, getting the side bearings off the diff case was a piece of cake.

That's pretty spectacular.  

Water intrusion?

buzzboy said:

Water intrusion?

Yes.  I think.  There was a tone of chocolate milk to the gear oil.  I just don't know where the water came from.  Vent tube is not broken, and is mounted up into the box crossmember.

I was wondering if it was coming in the pinion yoke spline, because the front pinion bearing was stuuuuuck so hard, I had to torch the inner race to get the pinion out of the diff, and looked to be rusted on.  But, the spline wasn't rusty.

Dunno.

Boat ramp in a previous life, it was probably in there for a while.  Nice Carnage!

I'll go with moisture wicking through the pinion splines, so yes boat ramp life. That's why I'd always put a splash of PTFE thread sealant on the pinion splines.