2005 LJ automatic ( 42rle)
I’d like to install an auxiliary cooler and temperature gauge
Any advices or how to ?
Thanks ,
Dan
I’d like to install an auxiliary cooler and temperature gauge
Any advices or how to ?
Thanks ,
Dan
42RLE auxiliary cooler and temp gauge
- Thread starter BigDan
- Start date
Here’s a good write up for the gauge:
https://wranglertjforum.com/threads/installing-a-transmission-temperature-guage-in-a-42rle.28410/
https://wranglertjforum.com/threads/installing-a-transmission-temperature-guage-in-a-42rle.28410/
I just did this. I used a Derale cooler in the grille area but plan to replace it later with the Setrab unit. I got my pan from Blaine on here and put the gauge in front of the 4wd selector
OP
I wont install the sensor in the pan
The most effective way is on the exit cooler line going to the rad
The most effective way is on the exit cooler line going to the rad
No. The pan temp is what you care about.
It is not right way of measuring the temperature. This will tell you temperatures that are way higher that how the transmission temperature is defined. Also, the output fluid temperature fluctuates a lot, especially during the acceleration
The transmission itself does not measure that way. The transmission temperature sensor is located inside the range selector column inside the valve body. It correlates very well with with the pan temperature, unless you are driving really fast in the cold weather.
I've installed sensor in pan and installed the setrab mentioned above. Saw roughly a 40 - 50 degree reduction during hot times pulling up a hill on the highway.
OP
Ok then
Ill probably install a drain plug and install the temp sensor in it
Ill probably install a drain plug and install the temp sensor in it
From the moment that I installed the Derale electric cooler, my transmission never visited above 185F. Like never.
Derale electric cooler comes with 7 inch electric fan, the moment it kicks in, it immediately drops the temperature to ~180F area.
Reason why electric is better, is because it does not impact the airflow to the radiator, and works perfectly fine in very low speeds, like when you crawl.
Derale electric cooler comes with 7 inch electric fan, the moment it kicks in, it immediately drops the temperature to ~180F area.
Reason why electric is better, is because it does not impact the airflow to the radiator, and works perfectly fine in very low speeds, like when you crawl.
I did the Derale cooler, made a small cage for it and put the temp gauge on my roll bar pillar. I had Blaine hook up the sensor port and have had no issues.
LONGJP2
TJ Expert
The TJ specific Derale cooler is good for a bolt in solution.
On my LJ, I eventually moved it farther back, under the tub.
So, I could have bought a cheaper one not in a kit.
Here's my gauge.
OP
Bought a drain plug kit from dorman p/n 65128
Retap regular plug thread to 1/8 pipe thread , suits the sensor perfectly ( depth wise)
Took your advices on this one
Thanks ,
Dan
Retap regular plug thread to 1/8 pipe thread , suits the sensor perfectly ( depth wise)
Took your advices on this one
Thanks ,
Dan
Last edited:
have been doing some trails last weekend. Not extremely technical ones, more like light ones, especially taking into account that the land is completely dry.
I got my transmission to 187F, but never went beyond.
OP
Just to show
I thined out the thickness so the sensor tip will stick out ….
I thined out the thickness so the sensor tip will stick out ….