Overcooling a Auto Transmission?

Hi Everyone,

I just purchased a 2006 V6 4X4 automatic Access Cab without the tow package. I've read several threads on what trans cooler to install and many mention to use the Hayden 678 / 679. My only concern is that in the winter in Upstate NY it gets pretty cold outside. Would I be doing more harm than good by over cooling the transmission in the winter? I usally only tow in the summer time and I tow about 3500-4000 lbs for about 300 mile distances.

BTW, does anyone know the dimensions of the TRD trans cooler?

Thanks in advance for your advice

 

Up here in Alliston Ont, it gets awfully cold winter and some summers.
You won't have any problems, you will protect your tranny and increase it's
service to you.

 

If the stock cooler is left in line it will actually use engine heat to warm the transmission fluid in after startup then use the coolant to maintain the temperature. The stock transmission cooler (not the tow package auxiliary cooler) is part of the radiator and shares heat/cooling with the engine coolant.

 

Current trans cooling uses the cold side of the radiator's coolant

When you add an external cooler, it should be in series with the current cooling method, taking the hot trans fluid, cooling it, then running it through the current radiator cooler. This causes the trans fluid to be returned to the trans pretty close to the engine operating temperature in any weather.

 

I have a 09 with the oem towing package and I see no change in the winter when I drive Upstate. The guy from Quebec is right. New York is not cold. Just install the cooler and the termostat will take care of the rest. This is the best investment you can make on your transmission.

 

This ^^^^^^^^^^^^^^^^^^.
Alliston, or southern ontario, isn't northern Ontario cold but could be comparible with up state New York. We might get some cold snaps on severe winters and some wind chill numbers in the -30 C 's at night occasionally. I think this is what KJMC was implying.