8 3/4 spitting gear oil out of breather vent

George Jets said

Wonder if the gears are running hot, boiling the rear end gear lube out the vent? No Backlash between Pinion and Ring Gear

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That is a thought.

My builder said to take it easy for 500 miles.

I bought a Bluetooth temp probe and taped it on the the bottom of the pinion bearing part of the center section.

When I drove it I monitored the temp I kept it under a couple hundred deg, like 130 to 180.

Speed, load, etc increased the temp.