A question that I am not sure how to even ask...

Not an expert...more farmer mechanic here with little knowledge of your engine...am interested though in what you find out. I was thinking maybe it went into the coolant passageways? Maybe pulling the water block drain? What do you think of using diesel instead of ATF? I've found it an excellent lubricant for freeing stuck rusty/gummy parts...in fact, got my heater box door soaking in it now. Old German farmer uses it around here to free his model T enginevalves when they stick...just an idea...I used it to clean out tar in an old Graco spray unit...worked great.