solution to locating transmission temp out probe

[SDrake]

I have noticed parts for $100-$150 for locating the transmission temp probe port in the line out of the transmission to the cooler. Anybody found a cheaper way to do this on my 2003 48RE transmission. I am thinking just replumb the line with hydraulic fittings or something, Perhaps just cutting a section out of the line and putting some sort or T in it using hose and a T fitting. I haven't studied that out real well yet and suspect the tub couplings depend on the tube rigidity for integrity.

 

[Prairie Dog]

Thats how I did it on my old 93 CTD. I cut the line, installed a brass tee and stuck the probe in it. Problem was, trans fluid kept leaking past the threads no matter what I did. I even tried hyd fittings but it still leaked. Finally, I found some expensive, commercial (not available to the public) hyd fittings and that did the trick. If I were to do it over again, I would just buy the new line and be done with it.

 

[rscurtis]

Put it in the pan. Watching the hot line temperatures will do nothing but alarm you. It's like trying to judge the temperature of your house by watching the stack temperature on your furnace.

 

[cerberusiam]

Put it in the pan. Watching the hot line temperatures will do nothing but alarm you. It's like trying to judge the temperature of your house by watching the stack temperature on your furnace.

Thats the other side of the coin. :-laf







Call Genos and see if they still have the fitting that goes in the rubber part of the front cooler line. IIRC, it was less than $20 when I got mine. You could probbaly source the same thing in a parts store or hydraulic supplier.

 

[SDrake]

Thats the other side of the coin. :-laf







Call Genos and see if they still have the fitting that goes in the rubber part of the front cooler line. IIRC, it was less than $20 when I got mine. You could probbaly source the same thing in a parts store or hydraulic supplier.

I forgot about the rubber transition to the cooler. If Genos doesn't have the fitting I will explore that area.



I agree about watching the temps in the line as being alarming. I switched from the pan to the line on my 94 when I installed a low stall converter, just to observe out of curiosity and I went through a few "what's going on?" moments. I like the comparrison to watching the stack temp in my furnace to judge the temp of my house but I add to it that I want to avoid a chimney fire while I am keeping warm. Not a very valid comparrison. I just got used to watching the line temp. So since i have to do something to the pan or to the line I just thought why not use something that has been worked out.



I agree with Prarie Dog that just spending the money is often the best idea unless you have your way of doing the mod tried and true.



I am busy rounding up all the fittings for a cat 2-micron filter and water separator upgrade. It is amazing the variety of hose fittings that are out there if you can just get oriented on the sizing and all. Somehow it all tied into looking at that metal transmission line with the thought that "you are next":-laf

 

[JoeLeonard]

I was looking at this part. A bit expensive but very clean. DieselManor - Dodge Generation 3 Cooler Line

 

[AH64ID]

Put it in the pan. Watching the hot line temperatures will do nothing but alarm you. It's like trying to judge the temperature of your house by watching the stack temperature on your furnace.

Considering that ATF is damaged by heat sooner than the transmission is the hot line is all you should watch.



IMHO pan temp is like putting the pyro probe post-turbo, sure its a temp but your really not getting the whole story.

 

[SDrake]

I was looking at this part. A bit expensive but very clean. DieselManor - Dodge Generation 3 Cooler Line

I think that is the part I had seen, $145. Got under my truck today and looked things over. It has that same area of rubber hose connecting two sections of the tube. If I knew of an exact fit of some hose onto that tubing I would just cut out that section and reconnect with more rubber tubing that had a T in it. Maybe a good hydraulic shop somewhere. Careful though or I will spend just as much as if I had just ordered that good looking part and not have near as good a setup. Still thinking

 

[SDrake]

BTW, where is the temp sensor on these transmissions?

 

[NavyDood]

BTW, where is the temp sensor on these transmissions?

The transmission temp sensor is part of the governor pressure sensor which is attached to the governor body which is attached to the valvebody. So that means it records pan temps. ​

 

[AH64ID]

BTW, where is the temp sensor on these transmissions?

Like most vehicles the OE sensor gets pan temp; and the idiot light associated with that is more of a "time for a new transmission light" not a "your getting hot" light.

 

[Edgemann55]

I was looking at this part. A bit expensive but very clean. DieselManor - Dodge Generation 3 Cooler Line

Been running that same line for two years now with no problem. I also run the Mag DD pan and started out with the transmission temp prob in the pan but as said here the cooler return line is the best place to get reads. The pan just read 145-150 without much change. The output line can change 40-50 degrees depending on conditions. I want to know before it gets in the OH-S--T range.

 

[SDrake]

The transmission temp sensor is part of the governor pressure sensor which is attached to the governor body which is attached to the valvebody. So that means it records pan temps. ​

Thanks. On my 94 I just removed the factory sensor from the line and put the sensor for my gauge in its place. I see no such convenience here. Everything is uphill both ways.