Installation of Aftermarket Transmission Cooler to Replace Leaking OEM Cooler

Published 06/30/2016

Question:

Im trying to figure out if a transmission cooler that is advertised as having minimal pressure drop is the same as a low pressure cooler. Im bypassing the stock transmission cooler due to a leak and want to make sure I get a cooler that will allow cold fluid to flow through so I dont have an issue with too cold of transmission fluid in the winter

asked by: Paul

Helpful Expert Reply:

The general rule is that transmission fluid cannot be cooled too much, so using the largest cooler that will fit is a good idea, especially if you are towing. Since you intend to completely bypass the OEM cooler you will want to use the largest aftermarket cooler that can fit in front of your AC condenser. This is the optimum location for the cooler since it receives maximum air flow. You will also want to use the highest-efficiency cooler, a Class V stacked plate type like # D52506. This cooler is designed to avoid undue pressure drop.

I linked our page for all Class V stacked plate coolers as well as two articles that may interest you.

Transmission coolers usually install on the return line, which after being cooled by the radiator, has lower pressure than the outbound hot line. There should not be any issues with transmission fluid pressure after you install a new cooler so long as you ensure the fluid level is adequate for the extra volume presented by the hoses and the cooler itself. If you replace an OEM cooler with one that is substantially larger you could need to add a significant amount of extra transmission fluid.

expert reply by: Adam R