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Trans temp gauge?


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I realize that trans temp gauges have been discussed to death but I am about to install one in my 02 Yukon XL. To avoid the cluster cost and mileage reset I am going to install a single pod gauge and put the sensor in the pressure test port of the trans. I have read on this site where others have done this and was curious as to what kind of readings you got.

 

My friend at the trans shop said there was no issue with installing the sensor in this port because it did have fluid at the port all of the time. However, he did question the accuracy of the reading because this is considered a "dead port", meaning fluid was pumped to the port but it was a dead end and it did not flow by the port. Kind of like being pumped to the end of a pipe that was sealed off.

 

Has anyone installed a sensor in this port and if so, what type of temps are you reading?

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Usually this sensor is placed in the supply cooling line (not the return!). If it is placed in a dead passage it is likely not to give you accurate readings. It may read high if the case is warmed by the exhaust nearby, etc. or it may read cold if it is out on the edge of the tranny and the case is cooled by airflow, etc.

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Usually this sensor is placed in the supply cooling line (not the return!).  If it is placed in a dead passage it is likely not to give you accurate readings.  It may read high if the case is warmed by the exhaust nearby, etc. or it may read cold if it is out on the edge of the tranny and the case is cooled by airflow, etc.

 

 

 

 

As Rolandd stated, the supply to the cooler is the most accurate place to install the sender, the pan is a second choice. You want to find the hottest fluid you can find for the gauge to really help you.

 

DEWFPO

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The factory sensor is in the valve body in pan.

 

After a great deal of research I have discovered that the pressure port is NOT the place to install the sensor. I have talked to a reputable franchised trans shop, a factory rebuilder who supplies our co. with transmissions and Stewart Warner and they all say not to use this port for sensor. This port can reach pressures exceeding 300 PSI when under a load and the sensor is not designed for this. They also said the reading would not be anywhere near accurate because the fluid at this port is stagnant and is not flowing.

 

I have decided to install a remote filter kit in the line and have found 2 that offer this kit with the filter mount threaded for a sensor. The kits come with a gauge, sensor and all wires and connectors. As of right now, the info I have says to install it in the line going to the cooler. This will provide the most accurate temp readings.

 

I hope this info helps someone else who may be considering adding a trans temp gauge.

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