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Username Post: Transmission Temp. Sensor        (Topic#236381)
Senior Member
Posts: 656

Loc: Naperville, IL
Reg: 04-05-04
02-24-10 02:21 PM - Post#1868821    

Anyone know where the stock temperature sensor is for the transmission temp? Is it in the pan or on one of the cooler lines or somewhere in between?

So a reading at any given temperature is that the temp.of the fluid going into or our of the cooler or the temp. of the fluid in the pan?

If it ain't broke open it up and make it better 03 Silverado 5.3 Z71

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Bad Bowtie 
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Bad Bowtie
Age: 42
Loc: TX
Reg: 07-04-03
02-25-10 02:13 PM - Post#1869398    
    In response to mwright1

Good question.

I know our 2003+ trucks are prewired for the OE trans temp guage in the dash. For this reason, I'm guessing the sensor would be located inside the transmission. Valvebody maybe...?
GMC. We are Professional Grade.


Senior Member
Posts: 656

Loc: Naperville, IL
Reg: 04-05-04
02-27-10 07:23 PM - Post#1870760    
    In response to Bad Bowtie

Just wondering since I got my cluster 'converted' to the escalade style and now has a trans temp gauge. Highest it reads is 110 - 120 driving around town stop and go. Haven’t had extended highway driving yet. I do realize it's in the low 30's here but still thought the normal operating temp would be more in the 175 range. Which made me wonder where the sensor is actually located.

Edited by mwright1 on 02-27-10 07:24 PM. Reason for edit: No reason given.

Senior Member
Posts: 1400
Loc: Edmonton, Alberta
Reg: 05-11-03
02-27-10 08:06 PM - Post#1870798    
    In response to mwright1

That's normal, the cooler they run the better as far as automatic transmissions are concerned (not including extreme cold weather, which can also kill a trans). On a long highway drive or heavy city driving it should come up a bit more.
Josh R.L.
Licensed Automotive Mechanic
1966 Buick Special 2 door
1961 Chevrolet Apache 10 panel van
1995 GMC K2500
2011 VW Jetta TDI

Forum Newbie
Posts: 53

Reg: 10-13-08
02-28-10 08:04 AM - Post#1871026    
    In response to BBC-454

Anyone know if the 99 4l60e has a internal temp sensor?

I have a external gauge for it, but not sure if can tap a current sensor or if I need to install a new one in the pan.


Senior Member
Posts: 656

Loc: Naperville, IL
Reg: 04-05-04
03-01-10 04:53 AM - Post#1871692    
    In response to gsxr-freak

Yess, all the 99 and up full sized trucks come pre-wired with trans temp sensor and wiring, from what I understand.. Even if the truck (most 1500's) didn't come with the gauge, all the wireing is there. You can just swap clusters or add a gauge to the stock cluster in the open spot on the bottom left on a stock cluster with out one and it will work. That's what I did. Not sure about how an aftermarket one would work, if you could use the existing sensor and wiring or if you would need to start all over on your own?
If it ain't broke open it up and make it better 03 Silverado 5.3 Z71

Forum Newbie
Posts: 53

Reg: 10-13-08
03-01-10 04:26 PM - Post#1872000    
    In response to mwright1

Thanks. I found the swap info after making this post, but still can not find anything about an external gauge.

I just cant see spending 250+ on having my cluster worked on, or replaced, if I can use the gauge I already have. :D
Call me cheap but... lol


Posts: 379

Loc: Saskatoon, CANADA
Reg: 04-14-09
03-15-10 01:36 PM - Post#1880536    
    In response to gsxr-freak

.. there is a recent thread in the 88-98 truck forum about installing aftermarket trans temp guage

.. concensus seems to be to install the sensor on the aftermarket gauge into the "pressure test port", a threaded opening (just have to remove the threaded plug) which I believe is on the side of the transmission (on the driver's side)

.. then you can find a convenient location to install the gauge on, under or in the dash....

Edited by rodram on 03-15-10 01:37 PM. Reason for edit: No reason given.

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