"96' model F250. Should I go ahead and install another one anyway?"
Yes...better safe than worry.
External transmission filter and temp gauge.
I installed one of these
on our 95 Burb, different brand but same function.
Keeping track of tranny temps helps a lot when towing.
Have had very good luck with the B&M auxiliary coolers
over the years.
"Sticks & stones can break your bones...and hail will dent your Airstream"
So when is this..."old enough to know better" supposed to kick in?