I have got about 3000 miles on my '12 5.0L F150xlt 4x4 SCrew. This is the first truck I have owned where I can monitor the transmission temps. I haven't towed with it yet, but the highest temp I have seen is 199. What temps should cause me alarm, and/or what is the acceptable temp range for the tranny. I think it is a 3.55 rear end if that matters. Thanks for all input.
Since Ford uses a heat exchanger between the engine coolant and transmission fluid, it's going to always be around what the thermostat regulates. ( What is the factory thermostat temp?) I used to worry about it being 190 - 200, but that's being regulated by the design of the truck, which works I suppose. Sure wish it was closer to 165-170, but that's the way Ford does it. Since I tow quite a bit, I'll be changing the trans fluid more often.
About the only way to get it down would be to either put in a cooler thermostat, or route the transmission fluid to an external cooler, both of which are fraught with calamity.
I figured I was getting it a little on the high side. It cooled back down quickly but I wasn't to comfortable with it sittin at 218 for more than a couple seconds. Does anyone what the actual limit is before damaged is caused