I ran a trans cooler on my Toyota power steering set up on my old Samurai. It was a Celica box and pump and it ran HOT without it. Now on my 4 Runner, I thought I was going to run into the same problem, but so far so good.
![Fingers Crossed :crossed:](https://board.marlincrawler.com/Smileys/marlin/crossed.gif)
I have 2 trips to the Hammers and 4 to Big bear and it doesn't seem to get hot at all so I would say you don't need it.
![My Two Cents :twocents:](https://board.marlincrawler.com/Smileys/marlin/twocents.gif)
I guess it would depend on the type of terrain you are running, tire size and if you are locked up front.
![Driving :driving:](https://board.marlincrawler.com/Smileys/marlin/driving.gif)
If you do run one, I think the pump can handle the extra volume (the Celica pump did fine).
![Smile :)](https://board.marlincrawler.com/Smileys/marlin/smiley.gif)