sixsix

Yeah but it was 29 degress outside and the truck never moved.

manic5_2001

They will sweep but not at a 1 for one as the temperature climbs, they show normal operating range then once the real temp guage reads it climbing out of the normal operating range it will quickly climb (sweep) to the red then give an idicator. I learned this while messing with my Ranger trying to get a Efan installed it would blow a fuse and not turn on so I would be riding along and the needle would show normal. Then all of a sudden it would sweep up to hot. So yeah there are few centralized temp pressure guages that are reading reall numbers whats on the dash is not a 1 for 1 representation of what is goin on. Install a mechanical temp guages for your truck and you will see a big difference.

Cwprotek

I'll start my truck on a cold morning and put the transmission in neutral, then set the brake, at least on my old truck.

This one I start it for s minute then drive it easy for a couple miles.

Bryan Ex

Funny this discussion came up because I have always been nervous about how slow my tranny temp came up to normal versus the engine. Exact opposite of what most are claiming here.

tcp2

The transmission gauge on the 2009 and 2010 don't function properly. There is a TSB to fix this issue.
There is about 13.5l of oil in the 6r80 transmission and about the same in coolant in the engine. I promise you the coolant is heating up much faster than the transmission fluid. Having run a scanguage II on my 09 showing both coolant and TFT, the Transmission temperature gauge is not showing the correct temperature. It manifests itself as dropping down intermittently as well as rising way too quickly.

https://www.f150forum.com/f118/trans...-gauge-283443/

https://www.fordf150.net/forums/viewtopic.php?t=71405

https://www.f150online.com/forums/20...old-stops.html

https://www.f150online.com/forums/20...lp-needed.html

RLXXI

Holy old post resurrection Batman. 8 years, gotta be a record.
.

Pickupman66

I'm a bit perplexed by the trans running temps myself. I've had my f150 for a week and noticed it runs much warmer than the 545rfe from my ram. That one never got above 145 it seemed. Where this shows it's in the 170s or warmer. I thought cooler the better here?

tcp2

They run between 195 and 205. There is thermostat inside controlling flow to the cooler.

Bryan Ex

Actually a good thing IMO (with exception to the Mike Berkemann thread). It shows that folks are using the search function when they have an issue that applies to them. If the discussion is helpful they would reply without noticing the start date.

Pickupman66

that would definitely explain it.