spammagnet

Hello. I'm driving a stock 2016 Lariat SuperCrew short bed with a 3.5L EB and max tow package (not HDPP). The rated payload is ~1725#. I used FORScan to change the transmission temp gauge to display the digits above the gauge. I'll be towing a Rockwood Mini-Lite with a GVWR just a shade under 7000#. Everything including tongue weight is within the truck's specs when fully loaded as I will pull it.

What is the maximum acceptable transmission temp on the stock gauge? What is the maximum acceptable sustained temp on the same gauge?

I consider those to be different, e.g., if the temp hits X degrees I need to pull over, now, but even if staying below that I should not drive at X-15 degrees for more than 5 or 10 minutes. If my thoughts about that are misinformed, please advise.

Thanks in advance for your shared wisdom.

wolfpack219

This is somewhat what the Senior Ford Tech at my dealership explained to me. These transmissions are designed to operate at above 200 degrees F. Sustained temps between 210-230 degrees is fine and expected for towing or hauling in 100 degree temps. I've seen as high as 225 degrees doing just that in northern NM in mid summer at about 100 degrees outside had no issues. My last trip with temps in the 80's I saw. Sustained temps around 204 and as high as 214. Again no issues.

wolfpack219

Side note I think truck goes into limp mode near 240+ degrees, not sure of the exact temp.

13XLTEco

I am pretty sure for the 6 speed it is 220 the max sustained. Maybe it is more with the 10 speed.

wolfpack219

Not true according to the Ford senior mechanic at the dealership. Also I've experienced higher temps without issues or going into limp mode. However if you can source something from Ford I'd think that would be best.

13XLTEco

I read it on this forum, I'm sure.

spammagnet

Thanks for your insight.

danlexani

most peeps around here swear they don't go above 190 towing.... idk about that.... mine stays between 200-230 when towing but i'm also towing close to max load i think....
230-240 seems to be the high end of it and like someone mentioned around 240 is when you might get thrown in limp mode...

https://www.f150forum.com/f82/5-4-to...y-temp-448494/

Jeff1024

I want proof from anyone saying they are not going above 190 towing. I see 203 - 205 just driving 80mph unloaded on the interstate.

Towing our boat I see 203 - 210.

danlexani

then again mine stays around 160 around town all day... maybe 170 if i mash on it a little...

i did find out through here that there is a little thermostat valve on our tranny lines. i bought one just in case since i'm sure mine is the original one with 175k on it now... haven't installed it yet but i'll get it on in the next few months.

https://www.f150forum.com/f4/transmi...-valve-449855/