Sounds like the intercooler in the radiator has a leak allowing the coolant and transmission fluid to combine in the cooling system and transmission.
You'll need to replace the radiator, coolant and all of the transmission fluid and filter. You need to do a flush on the transmission - just dropping the pan and changing the filter will only change about half of the fluid. You need to get all of the transmission fluid out. Same with the cooling system - after replacing the radiator - flush all the old coolant out and replace with 50/50 mix antifreeze/distilled water.
Hopefully, the transmission has not suffered too much damage. Coolant in the transmission is not a good thing.
You'll need to replace the radiator, coolant and all of the transmission fluid and filter. You need to do a flush on the transmission - just dropping the pan and changing the filter will only change about half of the fluid. You need to get all of the transmission fluid out. Same with the cooling system - after replacing the radiator - flush all the old coolant out and replace with 50/50 mix antifreeze/distilled water.
Hopefully, the transmission has not suffered too much damage. Coolant in the transmission is not a good thing.