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Old 10-30-2014, 12:15 PM   #1
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Exclamation Automatic Transmission Coolers

Transmission Coolers
Is the factory installed transmission coolers in TVís with tow package adequate enough for heavy duty towing?
Have a 2014 Dodge Ram 4x4 5.7 Hemi Aut.6 and 3.92 rear with tow package but prefer a extra 12000 lbs transmission cooler.
Most failures of an automatic transmission are created by excessive heat. Living around the mountains and lots of time facing heavy head winds on the prairies I would think to be on the safe side extra cooling would be helpful.
I am sure the standard transmission cooler from the truck manufacturer is not over rated.
Whatís your opinions on that and who installed a auxiliary Transmission Cooler?
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Old 10-30-2014, 04:08 PM   #2
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Look up the specks on the factory trans cooler, the tow package should be fine,staying with in the rated towing capacity.
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Old 10-30-2014, 04:46 PM   #3
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The temp of tranny in my Tundra with factory tow package never changes no matter how hard I push it. Do you have a temp guage for the Tranny? If so, keep an eye on it. As long as it isn't getting hot you should be fine.
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Old 10-30-2014, 04:53 PM   #4
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GM says that the stock cooling capacity is adequate for towing within the range of the rated capacities.

I've towed with an aux cooler, and without. I've only had one trans go on a tow vehicle and I bought that one with 97k on it, so I have no idea how well it was maintained. Otherwise I've towed though mountains with 2 different trucks, neither had a trans cooler. I think cooling issues while towing were a bigger problem in older vehicles. As said, monitor the temps and see if it's really an issue. The only thing I'd be concerned about is prolonged temps above 120. By prolonged I mean 20-30 minutes or more.

That said, axillary coolers are cheap and an easy DIY project. If you feel better putting one in, you don't need us telling you to do so. Just do it, as they say!
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Old 10-30-2014, 05:47 PM   #5
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You have a new Dodge , look at your gauges, my 2014 3500 Diesel has Trans temp,
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Old 10-30-2014, 05:54 PM   #6
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The Dodge Ram 4x4 5.7 L Hemi 395 HP is rated for 10,400 lbs. towing and I am way under that with 5900 lbs. It was still old school thinking. When having a towing package I am sure Chrysler will cover them selves that cooling the tranny oil is adequate. Since '97 I haven't bought a new truck anymore I keep them to new. But for sure I can feel the power in the new technology. Thanks guys that's what I wanted to hear.
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Old 10-30-2014, 06:20 PM   #7
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Quote:
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. As said, monitor the temps and see if it's really an issue. The only thing I'd be concerned about is prolonged temps above 120. By prolonged I mean 20-30 minutes or more.
Hey Doc, did you mean 220? 120 is not hot at all. Mine runs at 150 on a hot day without towing. About 120-130 in Winter. About 180-190 when towing in hot weather. GM says the Dexron VI can be taken well over 200 with no problem.
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Old 11-03-2014, 06:01 PM   #8
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A factory installed tranny cooler will be rated to handle whatever the specs to your model vehicle are. Dont exceed those and you should be fine. As for myself my Escape has the factory cooler but I am pushing my little SUV to the limit. So I installed an auxillary unit from etrailer.com. about 60 bucks and an afternoon installing it. Cheap insurance to be on the safe side. Lowered my pulling temp about 12-15 degrees. If you are only using half your capacity you should be fine with the factory installed gear.
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Old 11-03-2014, 06:03 PM   #9
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My preinstall temps were 188 not towing and 202 towing. Trans oil is usually good up to 220. Some are higher.
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Old 11-04-2014, 10:14 AM   #10
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Hey Doc, did you mean 220? 120 is not hot at all. Mine runs at 150 on a hot day without towing. About 120-130 in Winter. About 180-190 when towing in hot weather. GM says the Dexron VI can be taken well over 200 with no problem.
Yes of course 220! Dex VI is far superior to Dex III in that regard.
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