Well, under the category of ‘only thing worse than doing a job is having to do it over’…
I took a job a couple of months ago to rebuild a 4 speed transmission that a customer bought from a well known Landcruiser vendor in the east coast. …
The case was pretty rusty; the gears not so bad. I blasted the gears and deemed them worthy and went ahead and rebuilt the unit. The customer said he would clean and paint the case after. So he does, installs the unit, and it starts leaking.

Upon close inspection he determined that the housing was cracked! He calls me and I have to tell him: never in 40 years have I seen a cracked transmission housing!
He cleaned around the crack, so it’s obvious now.
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My best guess is that someone dropped this. Fortunately I have a few extra cases around. Just sad to have to do this job over.