Do we have Transmission coolers ?? 2014 +

I believe it was 2010 they began to put it inside the radiator as an integrated unit. I do have the same gauges though. I think they took the gauge away with 2014 Tundras.

 

Yes Sean, that was me. The fix for me was to pin open the trans thermostat. This is the same as used in the procedure to check trans fluid level. Once pinned open trans temps dropped 30-35 degrees, down to the 160-165 range. All for the cost of a wire the size of a paper clip, 1.34mm diameter. In colder ambient temps you might have to unpin the T-stat, that is an unknown for now. As long as the tranny isn't over cooled, it will be fine. Installing and pulling the pin takes about 30 seconds. CLEARLY the stock Tundra tranny runs WAY too hot, but Toyota does this to improve gas mileage, their own words in their own documentation. To be at 200* going down the road empty is just silly. And once you start to pull to have temps start to race to the danger zone, is unacceptable to me.

 

Krohsis, could you give a little more info on where that jumper goes for the trans thermostat.

Like you I feel the Tundra trans runs way to hot. I have a scan guage connected to my 2015. With out towing my trans temp usually stays pretty close to the engine temp. But towing my 5500 lb travel trailer I have seen temps as high as 248 going up small hills. This is when the trans down shifts into 4th and 5th gear. I'm afraid to see what the temps would be if I ever head out west to the mountains.

 

https://www.tundras.com/threads/transmission-temperatures.3236/

tacouser, I did a short DIY with pictures on how to pin the thermostat open at the above link. If you have any other questions let me know.

 

A special thanks to @MillsTRD14
After weeks of trying to get this to work and trying everyone's PID formulas these worked perfectly for my 2017! I must have read your post a dozen times but somehow skipped trying yours until today. I was beginning to regret purchasing my OBDLink LX, but I'm glad I stuck with it and followed your post! Thanks again!

 

I know this an old thread, but I just want to make sure I'm not missing something here. I see where frogger says that gen 3 maybe don't have an external cooler. I'm asking cause I'm ready to do a tranny flush and the procedure here, https://www.youtube.com/watch?v=fLVZSoKbyZ0, has you hook hoses up and flush the old fluid out through the cooler radiator. Do gen 3s have this?

I am also doing a pan drop/clean and filter change.

 

Interesting I got no replies to this one. Anyway, did this with the above video and these two supplementals. I connected my drain hose to the upper outlet of the ATF Thermostatic Valve (see, tundra-transmission-fluid-flush-tsb, pg. 3). Make sure you clamp off the hose you take off, otherwise will get some spray-back. Worked great. Flushed three times and put in about 4-6 quarts each time, dependent on how much old stuff came out. Total change took 16 quarts. Seems like a lot, but that's what it took until I got relatively clear looking fluid from the drain hose. Drained about a quart out for final level check. Extremely glad I did this one cause the fluid that was in there was very dark, like oil change dark.