No cutting necessary and you don't need any additional fittings, just unplugged the tranny lines from the radiator cooler and connect it directly to the new external cooler. Plus, if this new external cooler fails, it can always return to stock set-up (without the oem external cooler).

https://www.hummerforums.com/forum/h...-cooler-35751/

 

Have you done this? I am ordering the tru cool today and was looking for the best way to install it, and no cutting or fittings sounds good to me lol Anyone else do this mod recently? Thanks!!