When I changed my stock engine out I replaced my 1 row radiator with a 2 row. When I did this the new radiator did not have a tranny cooler. So i put an external tranny cooler in from of my a/c condenser. The cooler is from a local napa and is about 9"x6" in size. Do you guys think this is a sufficient amount of cooling?

 

It you still have the stock stall, just nothing really high you should be fine. If you want to be on the safe side B&M makes a good tranny temp. gauge kit.