Whats the normal tranny temp? What temp would you want to like pull over and let it cool down?<br>SD03

 

My service manual says 180 is normal operating temp. My trans stays at just above 140 most of the time. Sitting in DC traffic when it is crawling it gets up to almost 180. I have not checked the summertime temp yet as I have just installed the guage about 2 months ago. I'm not sure what you would consider hot enough to pull over and let it cool down..

 

I have seen mine at 220 sitting in traffic in the summer time. Most of the time it's around 150 or 160.

 

I just installed mine yest. I have yet to see it go over 190 for any length of time. Even in traffic.

 

Most trans fluid deteriorates above about 220 F. Personally, I'd be concerned at anything above 200. As you probably already know, most of the heat is generated in the torque converter.<br><br>In my current rig, I've observed temps measured in the pan as high as 180 sitting in traffic in hot weather. I use an aftermarket TC and lockup controller, and as a result my temps rarely get over 125 F as long as the TCC is locked (moving over 30 MPH). Even normal city driving it stays below 150 F. <br>

 

according to the Mag-Hytec website....<br><br>

 

Just over 100* at highway speed with no load, 150* to 180* in town and 150* towing 5000# or so. Way to high when in reverse, All most 220*

 

TPilaske,<br><br>I like that! Good argument for a mag-hytec pan and lockup controller. BTW, I have a Mag-Hytec pan, too, and that is one very well made product (No affiliation with Mag-Hytec), and although I have never measured trans temps without it, I'm convinced that the heat-sink capabilities are very significant.

 

According to that little chart my transmission is going to last 400,000 miles In all seriousness though...I have a mag-hytec double deep pan and my temps runing down the highway are about 120* Sitting in traffic they will go to 150* But come right back down once you hit the highway ;D

 

According to my transmission man Bob at Bellflower Transmission in Bellflower CA the max temps to run are 250-260 is OK, at 300* stop and let it cool if not before.<br>Bruce

 

That seems a little high to me. From what I've gathered, the little tranny light comes on at 225 or so and by then, it's to late.

 

Yeah, I've gotta agree with you, BigBlue. I don't have the info in front of me, but I my recollection is that the GM 4L80E goes into the super-hot strategy over 225 F.

 

The chart is nice, but are we to assume that those temps are taken from the oil in the pan? My temp probe is located about 6-8&quot; before the hot trans line enters the heat exchanger on the side of the block. Therefore, my temps are read before any cooling is done to the fluid. In this location, I have seen the temps rise to 240-250* by the time I made the top of a grade when towing the 5er in the mountains. However, the temp drops pretty quick once you level out. This appears to me that the fluid as a whole, did not get that hot when it can cool back down to 150-160*.<br> Am I wrong in my way of thinking? ???

 

Sounds logical to me. Mine's installed in the Dodge Tranny cooler line.

 

The references to the temperatures that I have made are with respect to pan temperature. The rationale being the temperature of the oil as it is drawn into the pump gives an overall average of the trans temperature. No doubt that pre-cooler temps are hotter, that's why there's a cooler! There's sure to be a lot of theory, information and opinion on the subject. I see merits of both measurement methods, and don't think that either is wrong, actually that they complement each other. I think the more info, the better.