Aftermarket Trans Cooler Question

[IrnBru]

Did a search but couldn't find the results I needed. When installing an aftermarket transmission cooler which line should I tap into for the connection? I have a 4R100 if that makes a difference. I just bought a new travel trailer and don't want to overheat my trans.

 

[Canadian Expy]

Are you going threw the rad still? If you are I always did mine after the rad cooler then into the aftermarket cooler.
If your trying to see which line right or left in the rad to tap into I think its the right side but not 100%

 

[IrnBru]

Are you going threw the rad still? If you are I always did mine after the rad cooler then into the aftermarket cooler.
If your trying to see which line right or left in the rad to tap into I think its the right side but not 100%

Yes, still going through the rad since it gets fairly cold here during the Winter. Had some confusion at two parts stores after work. Tried to buy some more hose since my cooler only came with 3' of 3/8". Both stores stated they only had 5/16" hose and 3/8" trans fluid compatible doesn't exist, even though my box says that's what's inside. Hmmm....looks like they do have it; Buy Imperial 3/8" x 4-1/2' Transmission Oil Cooler Hose 240106 at Advance Auto Parts