OH MAN.... this is piss funny.
I knew the old Zephyr diff had a mountain of backlash in it.
I'd assumed, it had Shit the planetary gears,
Today, I attempted to drain the oil. (Drain plug isn't coming out in this lifetime)
Threw an ice cream bucket under it and undid the centre to let it drain while I bopped the axles out.
These things run a floating hub and separate bearing set up to the axle.
The right side axle slipped out and bearing hub has started to undo itself.... danger Will Robinson....sumfin isn't right.
The left side seemed ok, so grabbed the ice cream bucket.
I kid you not, not one drop of oil, nada, zero.... dry as a dead dogs dick.
Lifted the centre out and nearly dropped the friggin thing laughing.
The crown wheel and pinion teeth are ground down to a razor sharp finish.
The diff in this thing would've howled like a bastard......

It confirms why it came off the road in Sept of 1970......