DOH...... Trans cooler is indeed in at the bottom.... engine coolant is in at the top........

 

I have a 2001 Dodge Ram 4x4 318 and my transmission cooler is leaking as well and needs to be replaced. I will occasionally towing a car trailer that fits a full size vehicle and possibly a camper trailer. Can someone please let me know what size of cooler you think I may need, i'm leaning towards a 10,000 lb but i don't know for sure. Your help is greatly appreciated......Thanks

 

i believe mine was rated for 10,000lb idk i got the biggest one i could find rated for a box truck/semi

 

i put mine in the space between my passengr fender and the radiator. the stock cooler lines hold mine up