Trans Temp Question/Concern 2020 TRD Pro

I have been reading through a fair number of the transmission temperature threads, but sort of having trouble making sense of what is or isn't concerning...

I have a 5500/6k camper, but haven't towed it yet with the Tundra, so this all sort of started snowballing once I read about the 2019/2020s having the trans cooler removed. I went ahead and got ODB Fusion about a week ago and started monitoring temps with normal driving. I'm in Colorado and have been getting 245 degree trans readings with ambient outside temps at 35-40 degrees, and a mixture of uphill highway driving at 65-75mph and hills and decents at 40-50mph. This seems bad. I have read the tolerances are really up to 280, scary levels 300 - but with the ambient temps and lack of trailer load, 245 degrees is excessive?

If I get into S4, or the gear locks in 4th, 5th or 6th, the temps will drop into the 210s or 220s - but I can't get them to drop below 200.

For additional info if it matters - it's a 2020 TRD Pro, 35s, just completed a 5.29 regear, and it runs with an additional 400ish lbs from stock in the back, with a topper and Decked system.

Any thoughts are welcome - I'm thinking I should maybe just go ahead and have an aftermarket trans cooler put on, or could this be indicative of a different issue I should be looking into?

 

Tow in S4 like the manual says and you should be fine. That’s for a stock rig though. Your big tires and heavy additions put additional strain on your truck. Trans cooler probably a good idea for your application. That being said, those temps aren’t that bad.

 

Thanks much - had initially looked into them - unfortunately looks like they're out of stock with no ETA due to Toyota parts. Are there any other suggested companies for cooler kits? Haven't found anything from a search.

 

In the picture above, the pan and converter are the same temp. That usually doesn’t happen. Are your app setting correct and reading the right sensor? 245 for a TC would be normal for those tires/weight/hills. Both might be reading the TC PID for some reason.

If not, there is a user on here that sells add on cooler kits with the Toyota parts.

https://www.tundras.com/threads/5-7l-transmission-cooler-kits.60550/

Edit-same link as above.

 

Thanks for the info - I got the PID/dashboard from @jtwags - copied his information directly and didn't change any equations - so I think everything is correct. I will delete the files and reload them though just to be sure I didn't corrupt anything.

Edit: Also - if you scroll to the second picture above - pan is 226 converter is 246 - unsure if my screen capture at that time was just a coincidence.

 

Go drive and see if the pan and TC values change or are exactly the same. My TC will usually be 10-30F higher and only get close to pan temp when coasting.