I'm looking for some comparison information. I'm confident the temp bypass valve that feeds trans fluid to my factory external trans cooler is no longer functioning. My Gryphon shows trans temp of 145 and the cooler lines going into and out of the trans cooler showed 20 and 25 degrees (IR Thermometer) when I looked yesterday. Basically, the lines are reading ambient temp.

Would any of you who have the ability to read trans temp and have either an IR thermometer or thermocouple/digital meter, help me out by posting the trans temp and the inlet/outlet temps to your trans cooler?

While plowing or driving with the plow on, I'm heating up significantly quicker and hotter then I did last winter. This fall I had to put a reman'd trans in and the last thing I need is to kill this one quickly.

Thanks for your help.

 

With exterior temperatures as low as 25°f there is no reason for fluid to be routed through the cooler.
The cooler is there to lower fluid temps when the transmission gets hot.
You need to check the cooler when the trans temp gets up into the >180° range.

 

180 would not be uncommon for a trans temp. I would start to worry past about 220-230 deg. F.

My truck will usually run 150 or so on the highway in the winter. Even hotter in the summer, or if I'm pulling something.

Did you replace your trans coolers/radiator when you did your transmission?

Those components can trap alot of debris, even with a "flush".

I know even Ford will replace all trans coolers/lines/radiator when they do a transmission under warranty.

 

180 to 210 is about what I see when I'm plowing. That's too close to the critical temps for trans damage. I'll see what the cooler shows for temps when I'm done plowing out from today's storm. I'm going to guess it will read something close to ambient temp, as I think the bypass valve isn't allowing fluid to cycle thru the cooler.

When the reman'd trans went in, a new cooler was installed. But the lines and bypass valve are the originals.

My trans temp normally falls in the 145 - 150 range, depending on road type and conditions.

Let's see what happens in the snow...

 

200 is ok over 230 is bad. if your plowing your working it hard and a trans cooler wont work well moving slow. if you want to get it down some put an external fan on the cooler itself to help move some of that cold air on it. if you have skills i think it can be wired to kick on around 200 or so. im not very good with wiring though.