More recently, I had a trans "built" specifically for offroad abuse. I installed it, and a new Derale fan cooled trans cooler. Ran braided stainless lines and all.
Put the AN-8 adapters in the trans and cracked the housing. Learned about tapered fittings that day.
Ruined a $3500 trans. Had to get another of course.
So 7k plus a few hundred in fluids.
Lots of negative pressure.