Transmission cooler options

Another radiator fact that many are unaware of is the difference the number of fins per inch can make. The more fins the more cooling surface. Years ago I had a BBC CC and hauled an 11ft camper pulling a 4 horse trailer. I needed a new radiator and after the install I couldn't even going up an overpass on the x-way caused the temp to go up. The radiator shop felt it was the truck and tested everything imaginable without finding anything wrong. Just as I was ready to swap radiators with a friend to try his the shop called and told me he'd found there was one with more fins, it amounted to over 3,000 more. He swapped it out at no charge and that did the trick. I hauled with that truck another 8 yrs without any problem. I changed radiators on my duallie last year and a shop tried selling me one that had less fins than the OE. He told me that was all that was available. I refused it and got on the internet and finally found a seller who was willing to count the fins instead of just telling me they sold factory replacements.