Hello I wanted to know if any one could answer this Question. Can you run the trans fluid in a 48re trans to cool. My trans temp at 65 mph is about 140 on the highway and it runs about 160 in stop and go traffic. I ask because I and being told that it is no good to run to cool. That the trans is designed to run at a certain temp. I thought that the cooler the better and the longer the trans will last.

 

Thats what i heard to. Ive seen up to 180 while at the 1/8 mile track before, and usually hangs out around 140-160 as well in traffic. as long as it doesnt get too hot, your good. (Correct me if im wrong)

 

sitting in Alabama 100F one day in traffic during a car wreck up ahead I seen my Xmission go to 203F. So I just put the trans in N and it went back down to 178ish .. and so forth.
But that is due to the fact that I was idleing there not moving and the idle speed on the engine is turning the TC anyways generating friction heat from the fluid. Anyways... My transmission runs smooth as hell and I have a EDGE (Not hot).

 

I've always been careful once it gets above 200. When it gets to 210-215 it's time to go easy on it.

 

First of all, let's determine where your temp probe is. Is it in the pan? Or on the hot line to the cooler? Or one of the test ports?

The location has a lot to do with what you are seeing. Opinions here vary on that subject too. One point of agreement is if you have the probe in the test port-- stop! Not only does area not get a regular fresh flow of fluid (stagnant fluid) it will not show real temps and is very slow to respond to changes relative to the other areas and can be 40* or more lower than other areas. False readings occur and there is a little piston in that port that can be damaged-- and will damage your probe. I know this from first hand experience. I had a diesel shop install the gauges and a few days later when the tranny temp stopped working they pulled the probe and it was mangled.
I have my probe now in the hot line to the cooler. This will show instantaneous responses and will be the absolute highest temps found in the tranny. Another choice is in the pan. The pan shows the temps after it has come through the cooler so you are basically reading what temp the fluid is before making its way through the tranny. I won't argue the merits of either here-- plenty of threads here to search for that. But your statement seems to point to one of the test ports used and that is a no-no

 

Hello and thank you for your replies. I do have the trans prob in a test port and this is where it has been for about a year now. Two people from banks and a trans shop both told me to put it there. They stated it was where the fluid was going to be the hottest beacuse it was coming out of the pump. If it should be in the trans what do you ?

 

I had my probe in the test port, and the dealer said that was the reason the tranny went out so I wouldnt recommend putting it back there!

 

I'll let some of the other folks here in the know sound off about why you don't put it into the test port-- one of the reasons being you don't get true temps as you can see from your own experience. Into the pan or on the hot line...Like I said above there is debate on that issue I don't wnat to get into. Diesel Manor sells a line with the probe port already installed, easy R&R, check it out.

 

Banks and a trans shop told you to put it there???

Another reason to not ... aw the heck with it.

Banks tech support numero uno!!