For you guys that tow a lot.

When you installed your aux trans cooler, what kind did you get and where was your placement. I have heard under the body with an aux fan and the other one that goes in front of the radiator like the stock one.

Which one seems to work the best

Thanks

Larry

 

The one with the fan under the cab is nice because you use an electric switch for "on demand cooling". The stock cooler is fine when at a steady speed, regrdless of load (in my experiences). Stop and go or towing really slow is when the temps rise. So under the cab will not "over cool" your tranny. Probably not a problem in Oregon, but in Michigan, you can over cool your tranny. The heat exchanger under the turbo will help cool fluid in the summer, but also help warm the fluid in the winter.

You can put a cooler in front of the radiator, but you only have about 2 inches of clearance at best. You need to check some measurements with the hood closed to see what I mean. And you still have the problem of no (or very little) air flow at slower speeds. Another reason why the cooler and fan under the cab is a better choice.

I have had good luck with the stacked plate design for trans coolers. More heat transfer than just having tubes with fins. Just make sure you get a cooler with at least 1/2 inch fittings. The od of your stock cooler lines are 1/2 inch od. You don't want to create any restrictions in fluid flow.

I think your best bet is to install the cooler in the return line. The line that sends fluid from the stock cooler back to the trans. You can splice off of that, run it into your new cooler/fan setup, and then back into the trans line that connects to the trans.

Use some good quality hose like aeroquip metal braided. Get the stuff that is rated for 300 degrees and 300 psi. Use high quality fittings and you will have a nice permanent setup. The fan can be something as simple as a motorcycle radiator fan. Ebay had some nice "9 inch universal fan" that I picked up one for like $20. It is mounted in front of my stock cooler (just bairly cleared the grill). It really helps during stop and go traffic. It would be a good choice for the under the cab setup as well. Good luck