All I can recall about ATF has to do with 'burned' fluid.It's been reported in the past that,for instance: when stuck in a snow bank,simply switching from reverse,to drive,ten times simultaneously,attempting to extricate the vehicle is enough to 'burn' the fluid,after which it would compromise lubricity as well as all clutch pack performance,necessitating immediate flushing and replacement.It's only a 10-weight fluid to begin with,and any compromise to viscosity could endanger gear faces with high-pointing,heat-welding asperities,fracture,and release of metallic shards circulating within the galleys.
Also,should the trans cooler heat exchanger within the radiator breach,coolant will enter the transmission,and clutch bonding agents,while not oil-soluble,are water soluble,and would ultimately detach unless the leak was fixed and fluid flushed and replaced.A very bad day!I've seen this on a Toyota Corolla.
