Typical transmission temps?

Had the truck and trailer out the other day. Ambient about 50 degrees. Drove for an hour on the freeway, averaging 65 mph. Travel trailer was at about 4k lbs and just me in the truck, so not overly loaded. I drove in T/H and D and peaked at 217 degrees.

 

I bought the partial kit from @chasenicholas93, which included the cooler, mounting bracket, horn relocate bracket, hoses, and connects. I bought the OEM Toyota parts separately (the thermostat, hard lines, and the hoses that ran between them.

 

Thanks. If I see excessive temps towing the boat we'll be looking into a kit.

 

This was from two days ago. Towing my 2000lb boat in ambient temp of 59 degrees. About a 25 min trip to the lake. I don’t think this is excessive but when its 80-85 degrees outside I’m sure it will look a lot different.

 

After a ~20 min drive (10 local roads/10 highway)... 75 degrees, no hills, load is me and the dog (240lbs total)

 

Towing boat with added cooler. 205 pan/232 TC

 

What kind of numbers did you have before adding the cooler?

 

I was thinking the same thing…seems a little high with a cooler…no?

 

Depends on the weight of the boat. He’s in 6th gear at 76 mph and it’s only 205. I’d say that isn’t too bad.

Engine coolant is 205 also.

 

I thought so too. Boat and trailer are around 4500lbs. Before the cooler it would run 225-230 in the pan and 240-248 at the TC.

Texas highways are 75mph and I will go the speed limit when possible. Trailer tires are speed rated for it. I'm comfortable with the temps before the cooler and still comfortable with the temps.

Just want to make sure peeps don't think the cooler will magically make the temps under 200 towing in D at speed limits.

 

I just ordered the Setrab kit. If nothing else, for piece of mind. Towing my 2000lb boat to the lake 25 min away will probably not kill my trans. But if I get a bigger boat (someday) or a TT or tow longer distances then it will be ready and I’ll have no worries.

 

Well your comment would be slightly relevant if you said 205 and 230. But you choose the pan temp after cooler and the TC before the cooler. I think you've provided enough disinformation on the cooler threads.

 

In the hills just north of Boise, 60 degree day, 240 at the T/C, pan temp peaked at 220 a few seconds later. Not towing anything, just me in the truck and a new spray-in bedliner in the back. Running the mountain roads a little later at 65mph oftentimes had the T/C in the mid 230s. Not even going to risk running it in Hell's Canyon next summer heading up to hunting camp without a cooler. One of Nick's "ugly" weld kits should be arriving today.

 

What's the 232?

 

Probably TCC

 

torque converter

Does rise when unlocked but drops quickly once locked. No S4, just drive and go.

 

I assumed the TC, which fluctuates a lot more than the pan temp and drops faster too when not under load, and from what I’ve read will be higher in 6th while towing but I don’t fully understand the TC lock vs unlock.

 

Soon as it locks it drops. From a different trip...

 

Because the clutch is no longer slipping (which is what generates heat). Crank and input are at a 1:1.

 

Vehicle:2021 Tundra crew max. Running around town with ambient 50-70 degrees and transmission in D, driving 0-45 mph roads, transmission pan temperature is 200-204 degrees range. At 70 mph 204-206 degrees range.
Towing: 8 foot wide, 11.5 foot high, and 8500 lb. travel trailer.
Ambient 50-60 degrees. Cruise rolling hills on interstate at 65 mph with transmission in S4 per manual, the transmission pan temperature is between 204 to 209 degrees. Now if you put the transmission in D the pan temperature increases to 221 to 224 degrees. The engine will go to 5th and 6th on level ground but drops to 4th on hills. However trying to run in D with this heavy load has zero advantages as the gas mileage is not any better, the transmission is constantly shifting, and the transmission temp is significantly higher. Conclusion is run a heavy load in S4 per the manual for best performance.

 

Good data thanks for posting! How many miles were you pulling this trailer? That is gotta be getting to (reasonable) max weight travel trailer territory for half tons.

 

At first glance yes it does.

But assuming he has an unpinned thermostat, the temps won't go much higher than that by more than 5 degrees.

 

I have towed my trailer about 3000 miles total. It tows much more stable then my previous F150 with the aluminum body. That 4.30 rear end gives it a lot of guts for towing. Get about 8.2 mpg.

 

manaul only says to tow in S4 when going downhill. Reason being keep rpm up for alternator to ensure enough power for trailer brakes. If you towed at 65 mph on I-10 you would be ticketed for inhibiting traffic. Most go 80-85 mph.

 

Go ahead and do that if you want. Just don't come here and complain about your fuel economy or transmission temperature afterwards.

 

In all honesty the manual and Toyota (when I reached out to corporate) are very vague AT best in regards to S4…

 

Trailer tires for the most part are rated at 65 mph, people that tow at 80 are only asking for trouble.

 

I think Toyota even mentions not towing over 60 or 65 in the manual

 

Per above, a lot of trailer tires are rated 65 mpg max. Anybody, regardless of tow vehicle are irresponsible towing a 8000 lb. trailer at 85 mph. Stopping and emergency maneuvers are the issue. Regarding the I-10 comment about getting ticketed for embedding traffic at 65mph; I am assuming that Mad Max is being dramatic for emphasis. I have traveled I10 many times towing at 65mph including yesterday morning returning from Carrabelle beach and never been pulled over. Must have passed three state patrol. Every tow vehicle I have ever had recommended locking out overdrive for towing heavy loads. And per my earlier description what is the point in running in overdrive if you get no improvement in gas mileage and only heat up the transmission.

 

What app you running? I'd need a large tablet to have that many gauges and still retain a decent size for viewing.
Running OBD link and torque.
Being able share gauge setup would be a bonus as it can be time consuming to setup these screens.