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Old 05-16-2015, 10:15 AM   #1
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Transmission temp

I just bought a 2014 Dodge Ram 1500 with a 5.7 ltr V8 and 8 speed auto transmission. I'm not sure if it has a heavy duty transmission cooler or not. Would the VIN # tell me? Also, at what temp is the transmission getting hot? I appreciate all advice! Thanks!
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Old 05-18-2015, 12:26 AM   #2
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Winter or Summer? It's going to depend on outside air temperature.. Normal in summer could be 140 to 220 with a stock system with stock trans cooler. Over 220 I would think of adding a cooler.

I added a very large trans cooler to my F250 7.3 and I don't get over 155 no matter how hot the outside air temp is...

don't know about the Dodge but you really cant trust OEM trans gauges. Even though there are a gauge they reall have 3 setting cold, medium and HOT!
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Old 05-18-2015, 01:10 AM   #3
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I don't remember the numbers but I have the same engine in a 2012 Dodge and when monitoring the trans temp in summer it shows about 2/3s to the hot side with 90 degree temps, 65 mph and probably 235 coolant temps. Am I happy about this, no, am I diligent about watching it, yes. Have I seen it get higher and cause me to either exit the freeway, or take other measures to alleviate the concern, no. If I were exposing the engine to these conditions regularly I would have a meeting with my dealer and resolve my concerns but... BUT the truck seems to resolve itself at the elevated temps and is stable. I will monitor the transmission fluid and change it using the stressed recommendations and my nose. Incidentally 1l243 the Dodge has a menu readout for trans, oil and coolant temps.
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Old 05-18-2015, 07:34 AM   #4
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Husband knows transmissions, he said 160-180 was optimal temp, anything over 200 and fluid life is cut in half
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Old 05-18-2015, 08:22 AM   #5
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My Tahoe just driving around tends to be around the 170 mark. I guess that is where the computer wants to try to keep it. I have yet to tow with it yet. That will happen this weekend. If I hit 200 F, I am going to install a second external cooler. It job looks very straight forward.

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Old 05-18-2015, 08:29 AM   #6
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Use synthetic. It helps substantially.
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Old 05-18-2015, 08:30 AM   #7
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All trucks and transmission combo's will be different. Towing versus unloaded will give vastly different readings along with temp and terrain. For example, yesterday I towed the 14k beast through fairly level terrain and 85 deg OAT and my transmission temp was between 185-195 degrees F. Unloaded, the temps consistently range between 155-160F.
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Old 05-18-2015, 08:39 AM   #8
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If you add an extra cooler it will not be a bad thing.
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Old 05-18-2015, 11:57 AM   #9
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The problem is when your trans temp is running on the edge and your not working it you don't have very far to go when you hook up the trailer and start pulling a load or if the outside air temps goes from 70 degrees to 100 degrees.

I added the OEM 6.0 31 row trans cooler to my F250. It's been in three years now and I tow 12k in all kinds of conditions and it has not gone over 155. Winter needle hardley moves off the peg. Now this would not be optimal if you lived in Alaska but works for me..
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Old 05-19-2015, 10:28 AM   #10
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Thanks for all the comments! I'm pulling my 8K TT down the Texas coast in a few weeks and will keep an eye on the temp. Will my VIN# tell me if it has a HD engine/transmission cooler?
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