The biggest pain for me is getting the hoses off the steel tranny lines and put the new hoses in. I had to use knife to cut the old hoses up cuz I can't pull it off. I probably spend an hour on each line...
The grill took like 10 min.
I thought the ATF are pressurized so when the radiator does fail, the coolant wouldn't get in the tranny... or maybe I'm wrong
Anyway I put in a separate tranny cooler 1 month after I bought the truck.