Hey guys first post...........My trans in the summer (97 degrees) likes to climb up to about 220 in traffic. I have a full built trans and converter. Trans shop says its normal as long as it doesnt climb past 235 or so. What do you guys think?

 

where is the sensor? mine is in hot line going to cooler and it will get hot. i throw it in neutral if i am going to be sitting long

 

Im not sure actually, what does the temp line look like?

 

what temp do you get up to in stop and go? I will go and see if i can find the temp line

 

short occasional spikes to 220* are OK. But if it's pretty consistant, then I'd do something about it.

Nothing kills an auto trans faster than heat.

 

Never mind, just found the problem I think.......temp sensor is about 6 inches from the 5" exaust, going into the MAGTEC pan. Im sure that would put me 10 to 15 degrees higher

 

if that is the case, keep the sensor in that spot, get some 2" exhaust heat wrap and wrap that section of the exhaust. problem solved

 

Your tranny temp should be read from the entrance to the oil cooler and not from the pan. Thats built in and can be read with any aftermarket monitor.

Its ok to use the tranny pan for reference just to see what the differance is. The pan is showing the temp after the cooler up front.

Exterior temp is a big contributor to tranny heat. In Florida not towing anything with the air temp 93, my tranny shows 192 at 65 mph. Towing is 200-205. Running up along I-81 with combined weight of 23000 lbs, air temp at 65, tranny is running around 175 at 65mph. Running lite the 160's.

As suggested when stopped, slip the tranny into nuetral. It will drop from 195 to 175 in about 10 minutes or less. But will go right back up there when you get going again.

So if live down south or were its hot, change your fluid more often. Easy with your mag pan.

Dave

 

Hey thanks for all your help everyone, I will go ahead and heat wrap and run another temp sensor. Dont want to risk the trans!

 

My tranny is stock, and it will climb pretty high in stop and go traffic. As soon as I get back to speed, it will come back down just as fast.

 

One thing to be careful of is throwing the transmission into neutral in an overheat condition - unless the valve body has been modified to allow cooler flow in neutral, you may not be doing yourself any favors. Definitely want to wrap that exhaust though, just to reduce the heat soaking into the transmission. 220 in the pan is a bit high, so you may want to consider an aftermarket cooler with a fan on it in any case...

I prefer putting the aftermarket sensor in the pan to read sump temperature, as this is the "overall" working temp of the tranny. Putting it in the cooler line is a good way of diagnosing an overheating torque converter, but you're going to see a lot more fluctuation in the line as well, depending on whether the converter is locked or not. There really is no right or wrong, just preferences.

 

Thanks for the input, I knew when I posted here that I would get great feedback!

 

Eric;

No flames intended as you are an expert compared to me with trannys.

Its my understanding that the computer reads tranny temp at the Governor Pressure Sensor in the tranny.

Some people install another sensor in the line between the tranny, after the water to fluid exchanger, that helps warm the fluid when the tranny is cold and the tranny air to fluid cooler up front. That line also contains an in the line thermostat, at the entrance to the air to fluid cooler which opens and allows circulation thru the cooler before it goes back to the pan.

The thermostat can't be bought seperate if you think its bad. You have to buy the entire cooler to get it, or remove it and leave it out, which to me would be the thing to do.

It's obvious Dodge wants the tranny fluid hot before they circulate it thru the front cooler with this system. I don't know what temp that in line thermostat opens at. The Dodge Service tech did not know exactly what it was, but guessed 180 degrees.

I read tranny temp from the Gov Pres Sensor via the trucks computer and my
Edge Insight or Juice/Attitude device which ever is installed if want I've been told is correct. I feel its better to know how hot it is when working, than knowing how cool the fluid is in the pan. I guess an average temp can be otained using the pan and the temp sensor.

Here is a couple other threads that address some of this stuff. There are many more out there.

https://www.dieseltruckresource.com/...ht=Tranny+Temp

https://www.dieseltruckresource.com/...ht=Tranny+Temp

Dave

 

I don't take that as flaming at all - like I said, there really is no right or wrong way of doing it. As long as (1) you're watching the temps and (2) know how to interpret the results, you're a step ahead. It all boils down to personal preferences after that.

 

If we are talking about the 48RE, fluid flows in neutral, not park. I think that it why the suggestion was made to put it in neutral when stopped.

oops, I just realized it is a built tranny, so you are correct. It is possible the VB does not flow in neutral.