That is the only reason I have ever heard of for putting it in the pan. By putting it in the hot line, you are reading the fluid as it leaves the trans and heads for the cooler, and there for tells you how hot the fluid is inside the trans. With it in the pan, it tells you how hot the fluid is after going through the coolers, and there is usually a 15 to 30 degree difference. I personally want to know the numbers, not guess.

 

Because where your temp probe is the fluid is stagnent!!!! You are measuring trans case temp and not fluid temp as I mentioned above. The test port you are using, irregardless of where it is at is used to test pressure. If you want to see a change it will be to late for you since you do not have a base temp since you used the wrong location. Do a serch and you will see that test ports are not the best place to use for temperatures. The hot line is the best since it gives you fluid temp as it leaves the converter to the coolers. The pan is second best since it is circulating fluid but after the cooler and after it cools the 4th gear piston support. Anyways...syn fuilds lower the operating temps 10-15 *.......not case temps. Remember that the trans case also acts as a heat sink.

Richard

 

Just so people know. That chart is so old it should be banned from the internet. It was for temperatures for transmission temperatures before ATF+3. Modern transmissions use a synthetic (partial synthetic) ATF+4. The temperatures can reach and sustain 200 without problems. If memory is correct it does not start breaking down causing varnish buildup until around 280 degrees.

 

Temperature taken in any location should be the same for that location. So if it was taken in that location before flush and change then it should read correct in that location.

I suspect the flush loosened something and is causing a blockage or the filter is plugged or installed incorrect.

I personally disapprove of transmission flushes, but then again who am I.

Another reason why I don't like using expensive fluids, if something got screwed up you get to dump it and buy more. Take the pan off and check the filter or simply replace it. Make sure there is no old gasket (rubber grommet) stuck to mounting surface.

Try removing your sending unit and leave hole open, start truck in neutral for a second, then shut down. If anything is plugged by the sending unit it should flush out. Be warned there is going to be a fluid mess on the floor.

 

I meant the t-line install is for easy install the pan would be harder to install then a tee if you don't have a pan with a bung or can weld your own on the stock pan..
My autometer trans temp gauge said for the most accurate reading the probe should be in the pan..........
the fluid in the pan is what your trans is sucking up and pumping through so that is the temp I would want to know.....


BTW you still never answered me about the band adjustment....slipping band=excessive heat, especially if you have new "slicker" synthetic fluid

 

I didn't realize that was directed at me, but yes slipping band/tq =excessive heat regardless of fluid.

 

sorry that part was meant for the original poster..sorry for the confusion

 

The bands were adjusted at 30K

 

when i had my probe in the test port i could never get it to read over 160 degrees- in 80 degree weather!!

 

There is no flow in the test port so it has probably been collecting gartbage around the end of the probe for some time. The flush probably loosened more garbage and run it in there so it is holding heat more. Pull the probe and see if it has a buildup on it, if you can get it out. Probes in that port have a tendency to get beat up by the piston behind it, which, will also effect the readings. ANY readings from the test port are of questionable reliability.

The temp of the fluid in the pan can be well within limits and still be bad. The bulk of the heat is created in the TC by fluid shear. It makes no difference if your pan temps never break 220 and the hot line temps are consistently over 300. You will never see the temp spikes, the fluid will be compromised, and the trans on its way out.

Pretty much a no brainer, measure the temps that will compromise the fluid or measure the burned and cooled fluid.