I was wondering what some normal trans temps are for the 4r70w transmissions. I have an Edge that monitors the temp and normally the temp is around 150 degrees F. Lately, for no apparent reason, I have noticed my temps going up into the 180's. I am not towing/hauling anything or climbing any hills, ect. Same driving conditions as before accept for maybe that it isnt winter anymore.

The truck is a 2005 2 wheel drive with the 5.4 and around 40,000.00 miles on the original trans fluid. Is it maybe time for a fluid change?

Thanks in advance,
Devildog101

 

Good question, sounds like there is a problem somewhere. Here is a link to trans oil temps and the effect that heat has on shortening the life of the fluid.

heatchart

 

I have 100,000 on mine. Had a tranny service at 30,000 and a flush at 65,000. It stays between 146 and 156 depending on outside temp.

 

with 40k on it i would do a service

 

This exact discussion was held a few days ago at https://www.f150online.com/forums/19...emp-range.html

 

Thanks to all that replied. I have been meaning to get it done since around 35k. I have an appt to get it done in the morning. It has only gone up above that normal 150 ish twice so far. Cant explain it. Everything has been working as normal, no issues.

We will see,

Thanks,
Devildog101

 

IMHO, I don't like to see my trans fluid temp get above 180F for any extended time. i know in big-rig diesels with auto's, the mechanics use to tell us the same thing- 180F....

 

You'll notice different temps from Winter time to when it starts to get warmer.

You'll run around 180* not towing anything and especially in stop and go traffic when the weather gets warmer.

It's normal and changing your fluid is not going to make a difference in temps unless it's really nasty stuff coming out, but then you've already done the damage if that was the case anyway...

Mitch

 

I see 210 in town beating on her, extremem conditions I see over 220. Just as long as your trans never heats up quicker than your engine, your fine... Its the coolant that brings your trans up to temp. Towing, not in OD, the trans wont hit 160... but when it levels out and I kick on OD, itll drop to below 120 in a matter of seconds...

 

Had the tranny serviced at the dealer today. Afterwards, I decided to drive around town for a long time, to see if I could get the temp up again. Only got it to 160 for a second, and then right back down around 154 like normal.

Thinking back, my driving style has changed recently. I did switch jobs and bfore I lived about 3.5 miles from work and 2 miles of it was highway. Now I am about 28 miles from work and 10 of it is stop/go driveing. I have always mostly driven very short trips in the truck with the occasional longer one. This may have been why I was seeing different temps than before.

The temp is staying lower, and the trans definately feels different now. Not that it felt bad before, but it is even smoother now.

Thanks to all that provided input, it was greatly appreciated.

 

So according to Mike Troyer, 180 degrees is considered a cool temperature. That being the case, most of us have nothing to worry about.

This is true. As I monitor my ScanGauge II, I notice that the transmission fluid temperature takes longer to come up in temp, but also takes longer to come down.



Your Edge programmer is reading the trans temp from the PCM, just like my ScanGauge II.

 

Edge?!?

Dont' let BJ see this!

WTF did you ever get that notion? You been listening to Deux Impostinators ? I use a dedicated gauge for this function, so go ahead and add 30+ degrees to yer SGII reading

MGD v5.0

 

Sorry. I was referring to Devildog101. His original post said that he had an Edge.

 

I have both a dedicated gauge on the "out" cooler line, AND read off my Gryphon (which read from a sensor screwed into the valve body). Most times, the temps run exactly the same. Thus far, I have only seen about a 5 degree difference, at most. I have wondered if the valve body sensor is plugged into the cooler circuit. I recently towed something that got the gauge temp up to about 200 by the gauge but I forgot to have the Gryphon set to read the trans. Might have shown a difference then and it would have told me more.

 

I guess the only way to know is to put a gauge on your cooling line, and then another one in your return line. That way you know how hot it is coming out of your transmission, and how much the fluid cooled before going back to the transmission.