I know this has been asked Numberus times before but iam gonna ask it in my own way so i under stand it better... I have just installed a tranny temp gauge in my truck ISSPRo i have the sending unit in the test plug above the pan on the transmission... where i was told to put it http://www.dieselmanor.com/diy/CMS3-gauge/G3image7.htm
I want to know what temp is safe and whats too high.. i don't pull anything maybe the odd sled trailer with 2 or 3 sleds threw the mountains in BC..
thanks
In town in traffic i hit about 195.

 

With your sending probe there it as 20 degrees off temp from the hot line so if your reading 195 and it is acutally 215 in the hot line!! Which is pretty warm. I have the mag hytec deep pan and the probe is now in there and I can't get mine over 180.. Which would be 200 in the hot line!!

 

what would be harmfull..?

 

It's a VERY SLOW temperature rise, since you are reading a 'dead' leg pressure port. Essentially you are reading the trans case temperature. What you want to read is the transmission fluid temperature.

The easiest way is to use a mass diesel 'hot' side cooler line that has a fitting in it for the temp sensor or a trans pan with a pipe plug for the temp sensor. There are pro's and cons to both. But most agree the pressure port will not give you enough warning that you are cooking the trans.

HTH

Tony

 

Not to hijack the thread, but I was curious as to how well the part that Geno s has for the probe would work?
I was thinking about using it.

 

NO, iam not putting a line port in.. Iam using the spot where they told me to.. I dont like changing things around so they work differently... I'll just keep it there and add 20degrees

 

Here are a couple of charts I saved to my computer after reading other threads about tranny temps. Maybe they will help a little.


Also, I definately think adding a Mag-Hytec Double deep trans pan is a great mod for our auto equipped trucks. It takes longer to heat up that extra 4 quarts of fluid so it gives you a bigger margin for error while pulling that big hill, IMO. http://www.genosgarage.com/prodinfo....=MH-727DD-9803

 

That's NOT the point. You could get into a situation that cooks the trans fluid long before a pressure port will show a temperature change. To read accurate and timely temperature changes, the temp sensor needs to be in the fluid as it is moving. The only way to do that is to get the temp sensor into the fluid used by the TC, that would be either the HOT line leaving the trans for the cooler, or in the transmission pan.

Geno's sells an interesting adapter that clamps the temp sensor onto the trans cooler line. You don't have to open any transmission line or spill any fluid.

I'm not trying to upset you...just trying to educate you. I understand you don't tow heavy. I don't either...yet. My point is that I am trying to pass on information I have learned over the years. I would rather take a little extra time and a little extra money and do it right the first time, 'cause I HATE DOING IT OVER!

HTH

Tony

 

The adaptor that Tony mentioned is the one Im wondering about.
Would it give an accurate reading if installed on the hot line?
Personally, I dont want to have to change anything from the way they are now?

 

why do they recomend putting it where i have it... it would show the same temp thats in the pan right...?

 

I have an ISSPRO temp gauge with the sender in the port as you. The highest temp I reach is 160, even in traffic on a 90 degree day running the AC. I will eventually put in a new line, as it is a better option. My understanding is that this port flow fluid except park and reverse - I could be wrong.

 

They don't recommend putting it there! The description at the bottom of that page starts out like this...

"Another location for installing the transmission temp gauge sender..."

The method they "recommend" is on this page: http://www.dieselmanor.com/diy/CMS3-gauge/G3image6.htm

You can buy the line from them (Diesel Manor) and that's the preferred method.

 

so whats a harmfull temp then..? i can run 195-200 all day long.. and no problems.?

 

Check out post number 7. I put in two different temp charts for auto trans.


Yes you can run 200 all day long and be fine.

 

Well the problem is you can't really be confident of the true temps with the probe in the test port.

Mine hits 205* sitting in stop and go traffic with 90-100* ambient temps. This is with the probe in the hot line. I think 220 is a pretty safe limit when you're talking about the hot line. Running at 200* all day long should be fine, but unloaded temps on the highway (while in lock-up) should be much lower (around 150-180).