I'm thinking of installing a new external trans cooler on my truck. My truck is originally equipped with an external cooler but I'm leaning toward scrapping all factory trans cooling lines and cooler and replacing with braided lines with an fittings. I'm thinking this would do away with the check valve and the risk of mixing trans fluid and coolant. I'm I overlooking something or do y'all think this would be more headache than it's worth. Thanks for the info and opinions in advance.

 

I have only rarely seen an in-the-radiator trans cooler fail. And I think the trans fluid is higher pressure than the radiator..... (until you shutoff the truck at any rate....)

Also, depending on where you live.... having the fluid TOO cool can be just as bad for the trans as overheating it. If it gets really cold where you are, don't bypass the radiator cooler..... if you do heavy towing with your truck, you can get a thermostatic bypass valve, that will bypass ALL the coolers until the fluid is up to temp.

 

I live in Charleston South Carolina so to cold is the least of my worries. Another quick question; is the fitting coming out of the transmission 1/4" NPT

 

Honestly I think going all AN fittings/steel braided line would be more of a pain than it's worth. Not to mention they're expensive! If the radiator cooler fails then you'll have trans fluid in the antifreeze. If you want to run a stand alone cooler and that's it I know B&M makes coolers that have a bypass until the fluid reaches a certain temp. You can get them so that regular 3/8 hose will fit then just cut the factory hardlines and flare them. Wouldn't look as pretty but would be a lot more cost effective . Here's a link to one.

http://www.bmracing.com/PRODUCTS/Aut...BTU-11x6x1-1-2

 

I know rubber hose Makes a whole lot more sense economically but an fittings and braided hose just look so bad a$$!