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Discussion Starter #1 (Edited)
I recently purchased a used Toyota Certified, 2015 SR Tundra, 4.7L, which happened to NOT have the towing package. Little did I know at the time the Catch 22 I would run into while attempting to have a "Tow Package" installed.

A little background, I plan on towing a light weight travel trailer (2400 pounds dry weight) and was told by the dealer my truck's towing capacity was rated at 6,800 pounds and therefore not a problem for my use as planned. Since then I've installed an 8000 lb Gross weight, with 800 lb. tongue weight trailer hitch (when used with a weight distribution system), a Tekonsha P3 Brake Controller, and a Scan Gauge II to monitor transmission temperature while towing. Originally, my plan was to add a transmission cooler just to have peace of mind while traveling through Colorado and other mountainous camping destinations. That was when I discovered my Tundra did not have the "Tow Package" installed at the factory, and therefore is not eligible to have it installed now (for some reason). See my written request to Toyota and their reply:

"I understand that my 2015 Tundra with 4.6L has a maximum towing capacity of 6,800 pounds. I pull a travel trailer that is well under the capacity, but would like the peace of mind of adding a transmission cooler to my Tundra. Is there a Toyota certified transmission cooler that can be added to my Tundra? Thanks. Question Reference # 200511-000188." "Thank you for contacting Toyota Motor Sales, U.S.A., Inc. We appreciate you taking time to e-mail us with your inquiry. We apologize, the supplemental transmission cooler is only available on 2015 model-year Tundra trucks with the optional Tow Package. We have checked the VIN of your 2015 Tundra SR Double Cab to confirm that this veh is not equipped with that package. In addition, this feature is a factory installed component and cannot be added at the dealership. We apologize as, other than Toyota Racing Development (TRD), we do not recommend or assist with modifying our vehicles from the original factory specifications. Toyota's warranty covers repairs and adjustments needed to correct defects in materials or workmanship of any part supplied by Toyota. Modifications to your vehicle could affect the performance, safety or durability, and may violate government regulations. Non-Toyota parts, or any damage or failures resulting from their use, are not covered by any Toyota warranty. Your email has been documented at our National Headquarters."

Well, that was not what I was expecting to hear, but not sure what else could be done, so I wrote a second request asking for Toyota to provide me with what would be the upper limits for the transmission temperature, just to I could be aware not to go over the recommended limits while traveling. Following is my second request and their answer: "With regards to my earlier question (Reference # 200511-000188), If my particular model truck is not factory equipped with a Tow Package, and therefore does not include a transmission cooler, would you please provide me with the transmission temperature upper limits rating while towing? I have heard multiple unofficial temperature limits, but I would like an official word on what the upper temperature limit would be before the transmission could possibly be damaged. This would help me to insure I am towing in a responsible manner. Question Reference # 200623-000060" "Thank you for the reply. We apologize, Toyota does not have any specific or technical information to provide regarding transmission operation temperatures for your vehicle or any Toyota vehicle. We kindly suggest contacting your local Toyota dealership for possible information. We are very sorry for the invonvenience. Your email has been documented at our National Headquarters under file #2005112705."

Well...I contacted the service department where I purchased the truck with the same question, and all he could say was that he googled "Tundra Talk" and the majority opinion was "about 240 degrees." When I asked if he could send me an email for documenting purposes, and he indicated this was just what he found from a "Google Search" and therefore could not be held liable for those numbers!!!!

Sorry this has taken so long, but am very curious what experience anyone has had with these two questions. Number one, is there a Transmission Cooler that might be recommended, or am I over compensating on that. Second, what are the temperature upper limits of what the transmission can handle? Thanks!
 

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John,
I have a 2018 Tundra DCab with the 4.6L V8 and have been towing a 3100lb travel trailer for about two years. I recently added an Ultraguage to it to measure transmission temps as my truck does not have the towing package either. So far on this trip through west Texas and central New Mexico on fairly flat roads the torque converter and pan temperature read from about 194 to 208. Once up in the mountains and motoring up steep grades the torque converter rises to about 237 with the pan temp lagging behind by 10 degrees or so. Once up the grade the temp on both drop back to the 194 to 208 range. The torque converter temp always rises faster than the pan temp under load but once back on level roads both temperatures come down and equalize fairly quickly. That has been my experience thus far.
KP
 

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Hey, thanks for the reply, that really helps. I recently installed a Veepack OBD Check and have been observing similar numbers between the pan and torque converter temperatures, though I’ve not taken it into the mountains yet. Plan on taking a trip to Colorado in a few weeks which will be the real test. From everything I’ve read, it appears as if Toyota’s tranny temps are designed to run hotter than what they used to, and they must know what they’re doing or we’d be reading about it in the reviews. Still, it bugs me that Toyota is so tight lipped about it. I’ve contacted them twice on the subject and they keep referring me to the dealer who hasn’t yet given me a straight answer. I haven’t given up yet.
 

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Neither of us are towing even half of the rated max tow weight so I figure if something happens I’ll fight that battle at that time. There are a lot of people towing much more weight than we are and seem to do ok. I’ll continue to monitor for now and see how it goes. KP
 

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If you are really concern go to your neighborhood auto parts store and buy a transmission cooler. Most will list the model type based on size and what you plan to tow. You can go up a size if you think you will tow beyond the listed values. Have it installed in front of your radiator so both the radiator fan and air flow can do the job of cooling the transmission fluid. At the same time have a temp transmission gauge installed and now you can see first hand how cool your transmission will stay even with max towing, hot outside temps or hill climbs. Turning off overdrive if temps are rising will do wonders in cooling the transmission
 

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Discussion Starter #7
If you are really concern go to your neighborhood auto parts store and buy a transmission cooler. Most will list the model type based on size and what you plan to tow. You can go up a size if you think you will tow beyond the listed values. Have it installed in front of your radiator so both the radiator fan and air flow can do the job of cooling the transmission fluid. At the same time have a temp transmission gauge installed and now you can see first hand how cool your transmission will stay even with max towing, hot outside temps or hill climbs. Turning off overdrive if temps are rising will do wonders in cooling the transmission
Thanks for the advice. I might eventually do that, but I’ve been forewarned by Toyota will nullify the warranty I still have on it. Pretty lame, but it is what it is.
 

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Neither of us are towing even half of the rated max tow weight so I figure if something happens I’ll fight that battle at that time. There are a lot of people towing much more weight than we are and seem to do ok. I’ll continue to monitor for now and see how it goes. KP
Agreed. I’m curious, what are you towing and is that dry weight? I’m pulling a Forest River RPod, with a dry weight of 2400 lbs.
 

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Thanks for the advice. I might eventually do that, but I’ve been forewarned by Toyota will nullify the warranty I still have on it. Pretty lame, but it is what it is.
Not true at all . Automobile manufacturers will try to scare you with nonsense statement like "any mod voids warranty". Every Toyota I've owned has been modified and some of those mods are done by the dealer. If you add a transmission cooler and it is done wrong and your transmission blows up then yes. But if the dealer or a shop you trust do it right and your rear diff goes out then your warranty is in effect. State to state have their unique laws regarding this but for the most part if the mod isn't the issue of why your vehicle has an issue the you are fine. But if you get into grey areas like you have electrical issues then yes they can say it was your transmission cooler and temp gauge that caused it. Make sure if you do it the shop you have install it knows what they are doing
 

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Agreed. I’m curious, what are you towing and is that dry weight? I’m pulling a Forest River RPod, with a dry weight of 2400 lbs.
I tow a Casita 17’ travel trailer. 2700 lbs
Dry if I remember correctly and 3100-3200 lbs when towed. KP
 
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