Hi Guys, I have a 4L80 behind a 6.0 (2005) and I want to install an aftermarket tranny temp gauge. Where should I mount the sender? Also, any recomendations on a good full sweep gauge that won't break the bank?

Thanks, Bigb

 

I bought this . I'm anxious to see what response you get here because I don't see any threaded holes for the sender, but it's tough to see the top of the transmission in my '04 Express.

 

Wow TX I posted that question 10 years ago! Never got an answer but I did install the gauge and it has been working fine ever since. I'll have to crawl under there when I get a chance, if I recall there was a test port on the side. I also removed the pan and installed a drain so I could swap out some of the fluid now and then which I have done regularly, and I installed a big transmission fluid cooler in front of the radiator along with two 16 inch electric pusher fans to keep the radiator cool in the hot summers here. The van is now at 120K and no issues whatsoever with the transmission. I am loaded with over 12K GVW all of the time in stop and go city driving (service body van) and I know that transmission would have failed a long time ago if I hadn't done all the cooling mods, at 30K the fluid was burned badly almost black which is why I did all the mods and saved it. PS I used the Autometer gauge as well.

 

BigB, wow I didn't even notice the post was that old! Thanks for responding. I am curious about the location of the test port and where you mounted your gauge. Pictures would be awesome!

 

The test port is on the driver side of the transmission - about centered front to back, just above the pan. It’s just a plug in the case.

A temp sensor can be mounted there or, if you’re already dropping the pan for service, a hole can be drilled in the pan and a bung welded in or you could find appropriate hardware to mount the sensor without welding.

FWIW, GM’s factory temp sensor is in the internal wiring harness for the solenoid control circuits (on valve body), so mounting the sensor in the test port may result in a different temp reading if compared to live data from a scan tool.