I keep the ATF warmer...or thermostatic switch..whatever it is called open all the time. I saw many on the Tundra forums did this since that switch opens up above 200 degrees. Not sure of the exact open temps but something for you to experiment with if you think your AT cooler isn't dropping temps enough.
I ended up ordering that hose as well.... I used your oem links (if that's your links) and that hose wasn't removed from post #4 at L Club. Totally ok with me, seeing that things are labeled a little differently. We can check to see what hose I end up leftover
I installed the OEM cooler and pulled a 3500 lb trailer over the weekend while monitoring AT temps using OBDLink. There are two transmission temp parameters - one that climbs dramatically when lockup goes false, and one that changes much more slowly and is always lower. Where are these two parameters sensed?
I assume #1 (the higher and more rapidly responsive one) is the transmission outlet to the cooler, and #2 (slower to change and always lower) is the cooler outlet / trans return?
I did not have the thermal valve pinned.
I saw temps of ~205F as long as lockup was true, but it would shoot up to 215 - 220 pretty quickly if lockup was false.
That’s pretty good actually. I pulled that camper from the picture above from Loveland to Cheyenne and my temps would get up to 250 if I wasn’t careful. 3800 lbs and a 20-30 knot headwind. Once I got on the highway on level ground it was right around 206F.
I believe you are correct on those temps it’s pre-and post cooler.
I don’t think so. I think you have to reset it with tech stream, and the Toyota literature has some rules you’re suppose to have followed before you reset - like drain/replace more than 50% of the fluid or something like that.
I've seen a few on GXOR in slow & go off-road...probably not in 4L get this one. Fluid temp was pushed to over 300 degrees. I have to look again but doesn't reset until below ~270 degree range. It is in a thread somewhere. I've yet to see anyone draining fluid on a 460 over 25K miles that is still translucent in any way.