Towing a 1900 lb T@B teardrop trailer on a recent trip, temps per my ScanGauge averaged 217 F. at 55mph open road, and spiked on hills and start/stopping to 240F a couple of times. Are these acceptable temps when towing? I have a new radiator, recently flushed and replaced the transmission fluid but still contemplating if I need Auto Trans. cooler. Radiator coolant stays around 195 F.
Transmission Fluid Temps when towing teardrop trailer.
- Thread starter greeney
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phattyduck
Elite Member
At 55mph, OD should definitely be off. Those sound like OD on (torque converter unlocked) kind of numbers. The button is there for a reason...
What's the weight on the trailer?
-Charlie
What's the weight on the trailer?
-Charlie
Brian.
Member
Sure wish my '99 would show trans temp on Torque Pro (just played with it today, only thing of interest was coolant temp)...
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jbtvt
New member
If the standard torque temp sensors aren't working give this formula a shot. It worked on my 4th gen, never owned an auto 3rd gen. Please report back if you try.
Torque App - working formula for tranny temp - Toyota 4Runner Forum - Largest 4Runner Forum
edit: there's another formula on page two. Thought I remembered trying a couple. Can't remember which one worked for me, or possibly both. Seem to recall one being the input and another being the output temperature.
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mtbtim
Elite Member
Your 99 offers trans temp info. Create a new display and choose Transmission Temp (Method 2).
mtbtim
Elite Member
Save yourself some money and do it yourself. The video below shows how to run the external cooler "in-line" with the stock cooler in the radiator.
<iframe width="560" height="315" src="https://www.youtube.com/embed/2nVbwe2t2T8" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
19963.4lsr5
New member
That temp is the oil temp exiting the trans going to the cooler.
I personally like to know what the oil in the pans temp is. If I’m driving around in upper 50’s to Low 60’s in lock up most of the time my trans pan temp is 100f. When I drove back country roads for 23 miles round trip and had the TC in and out of lockup a lot going up and down hills my pan temp was 121f. I like knowing how the coolers are doing rather than how hot the torque converter is making the oil.
In the end it may be one in the same. I just like knowing the sump temp.
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I personally like to know what the oil in the pans temp is. If I’m driving around in upper 50’s to Low 60’s in lock up most of the time my trans pan temp is 100f. When I drove back country roads for 23 miles round trip and had the TC in and out of lockup a lot going up and down hills my pan temp was 121f. I like knowing how the coolers are doing rather than how hot the torque converter is making the oil.
In the end it may be one in the same. I just like knowing the sump temp.
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19963.4lsr5
New member
LittleCaesar
New member
Also make sure the fan clutch is working well.
rightyouareken
New member
This is a good point. When I had the Scangauge installed in my 2011 Tacoma there were actually two sensors you could program, TF1 and TF2. One was the outlet from the torque converter like ours, and the other was pan temp. As you mention, after a few minutes of hard running the sensor after the torque converter was quite a bit hotter than the pan fluid temp. It was also really easy to see/confirm when the torque converter was locked because the two temps would more or less equalize. I miss having that visibility. On our 4Runners, the trans temp displayed is really at the hottest point, which is good, but I think it also has the potential to cause a bit of undue alarm.
