Can Transmission Fluid Be Cooled Too Much on a 2005 Dodge Durango

Question:

I hope you can help answer a question I have had for some time now. I have a 2005 Dodge Durango with the 4.7L engine. 4x4 The Durango came from the factory with the HD towing package. The only transmission cooler that it has is about 20x5x1/2inch and it does not go into the radiator. I am towing a camper that weighs about 6000 lbs. The Durango does well until I hit the least little hill. If there is even a small grade for any length of time the temp. gauge in the dash starts to rise. It has never gone into the red zone but it is still an uneasy feeling. I use the durango as my daily driver here in central Pennsylvania and I tow about five times a summer. If I add another cooler, will it be too much for the winter months when I am not towing? Is there a way to add a bypass to the extra cooler when it is not necessary? Can you recommend the cooler size that I need?

asked by: Allen W

Expert Reply:

First, transmission fluid cannot be over cooled so you would not have to worry about that. In the winter time, it would just take longer to warm up. Or you could use a special thermostat adapter, # D15719. This will only allow 10 percent of the fluid to get through until the temperature reaches 180 degrees. You would also need mounting brackets # D25793.

For a supplemental cooler, go with the largest one that will fit in the space you have. The most popular cooler for a 2005 Dodge Durango is # D13503 that you have referenced. I have included some links that should also help.

expert reply by: Michael H