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Discussion Starter · #1 ·
Can anyone say FOR SURE where the factory trans temp reading sensor is located?
in trans? In line? In cooler? trans temp reading sensor - where located?
thinking of using a separate cooler for my trans fluid.
Will the factory temp sensor still work? display in SRT pages?
 

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The electrohydraulic control unit (inside the transmission) includes the shift plate for the hydraulic control and an electrical control unit that is mounted onto the shift plate.
The transmission oil temperature sensor is located in the shell of the electrical control unit.
Temperature of the transmission oil is sent to the TCM (transmission control module) as an input signal from the sensor. The transmission oil temperature sensor is switched in series with the park/neutral contact. The temperature signal is transferred to the TCM only when the park/neutral contact is closed in Reverse or a forward gear position. When the park/neutral contact is open, the transmission oil temperature will display as the same temp as the engine coolant.

Adding a oil cooler will not affect the operation of the transmission oil temperature sensor or the display of the transmission oil temp on the SRT pages.
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Discussion Starter · #3 ·
NOW THAT, IS A SOLID ANSWER!!

Many thanks, I'm putting blue tops in this year and will be touching things - so this is great information. I never noticed the equal temps in park - but will look today!
 

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Discussion Starter · #4 ·
The electrohydraulic control unit (inside the transmission) includes the shift plate for the hydraulic control and an electrical control unit that is mounted onto the shift plate.
The transmission oil temperature sensor is located in the shell of the electrical control unit.
Temperature of the transmission oil is sent to the TCM (transmission control module) as an input signal from the sensor. The transmission oil temperature sensor is switched in series with the park/neutral contact. The temperature signal is transferred to the TCM only when the park/neutral contact is closed in Reverse or a forward gear position. When the park/neutral contact is open, the transmission oil temperature will display as the same temp as the engine coolant.

Adding a oil cooler will not affect the operation of the transmission oil temperature sensor or the display of the transmission oil temp on the SRT pages.
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So, while driving, trans temp was 171*, but it was 190* exactly as coolant temp, a few seconds after going into park. Interested way of triggering the trans temp sensor?
In the summer heat (54* outside today) and under harsh driving, trans temp has gone over 200*
I plan to mount a stand alone cooler with 700cfm fan, switched to 165* for better control.
Thanks again!
 

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The electrohydraulic control unit (inside the transmission) includes the shift plate for the hydraulic control and an electrical control unit that is mounted onto the shift plate.
The transmission oil temperature sensor is located in the shell of the electrical control unit.
Temperature of the transmission oil is sent to the TCM (transmission control module) as an input signal from the sensor. The transmission oil temperature sensor is switched in series with the park/neutral contact. The temperature signal is transferred to the TCM only when the park/neutral contact is closed in Reverse or a forward gear position. When the park/neutral contact is open, the transmission oil temperature will display as the same temp as the engine coolant.

Adding a oil cooler will not affect the operation of the transmission oil temperature sensor or the display of the transmission oil temp on the SRT pages.
.
The electrohydraulic control unit (inside the transmission) includes the shift plate for the hydraulic control and an electrical control unit that is mounted onto the shift plate.
The transmission oil temperature sensor is located in the shell of the electrical control unit.
Temperature of the transmission oil is sent to the TCM (transmission control module) as an input signal from the sensor. The transmission oil temperature sensor is switched in series with the park/neutral contact. The temperature signal is transferred to the TCM only when the park/neutral contact is closed in Reverse or a forward gear position. When the park/neutral contact is open, the transmission oil temperature will display as the same temp as the engine coolant.

Adding a oil cooler will not affect the operation of the transmission oil temperature sensor or the display of the transmission oil temp on the SRT pages.
.
I’m took my girl threw a good sized puddle and we nearly was hung up , point is I think water got into my tranny, but I am told that it’s completely sealed off and nearly impossible but I’ll admit I went fairly slow threw that puddle and she was big enough to have the bottom completely submerged. Anyways my coolant reads at 64(147.2F)Celsius and my trans temp is at 38-40celcius(100-104F)at Parked/started. What’s going on here, water in tranny? Sensor got damaged? Help!
 

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The 5-speed NAG1 TCM (transmission control module) is external to the transmission and the ATF temp sensor in internal to the transmission. Because of the way the ATF temp sensor functions the TCM will substitute the engine coolant temp for the ATF temp when the transmission is in Park/Neutral.
It's different for the 8-speed 8HP45 transmission where the TCM and ATF temp sensor are both attached to the valve body inside the transmission.
Which transmission is in your Charger?
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Before putting a cooler on, You could try removing the inline T-stat which I believe rated for around 180F.

Or perhaps try a Deep Sump Pan if you are worried about temps. I found my temps stablized a lot during Dragon's Tail and dragracing with this.
123671
 
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