What is the normal trans temp range?

[drodandsrod]

So I installed a Derale remote trans filter with a temp gauge and went for a drive to see what I'm running at. I installed the filter/sender before the cooler (it's just the factory in rad cooler for now). I was pleased to see the temps hover around 150 at any speed above torque converter lock-up. Driving around between 25 mph and 45 mph (lock-up speed) I was alarmed to see temps as high as 230. I was in 4wd driving on some pretty soft dirt roads but it was all pretty much steady state driving, no romping on it at all. Under 25 mph the temps came back down to 190-200 and stayed there.

So my question: what's the normal temperature operating range for the A340F? I didn't experience any noticeable slipping or anything but felt like 230 was high. I'm a little worried that my torque converter may be failing and creating excess heat. I haven't brake-torqued it to check stall but if I jump on it from a stop it seems like it flashes to about 2200 rpm.

Any thoughts? Am I worrying about nothing?

 

[calimobber]

I have an external cooler and on warm days on hills I'll see close to 200. Using scan gauge fir temps.

Flat on warm day I'll around 160

Turning off overdrive really helps keep temps down when towing.

 

[Drcoffee]

The better question is what is the optimal ATF temp.

120* to 170* is the target range.

Whats normal is closer to 210+.

I installed the B&M 70264 cooler and my temps run from 125* cruising to 180* towing

 

[19963.4lsr5]

So I installed a Derale remote trans filter with a temp gauge and went for a drive to see what I'm running at. I installed the filter/sender before the cooler (it's just the factory in rad cooler for now). I was pleased to see the temps hover around 150 at any speed above torque converter lock-up. Driving around between 25 mph and 45 mph (lock-up speed) I was alarmed to see temps as high as 230. I was in 4wd driving on some pretty soft dirt roads but it was all pretty much steady state driving, no romping on it at all. Under 25 mph the temps came back down to 190-200 and stayed there.

So my question: what's the normal temperature operating range for the A340F? I didn't experience any noticeable slipping or anything but felt like 230 was high. I'm a little worried that my torque converter may be failing and creating excess heat. I haven't brake-torqued it to check stall but if I jump on it from a stop it seems like it flashes to about 2200 rpm.

Any thoughts? Am I worrying about nothing?

Can you post a picture of your mounting position for the remote filter? Been thinking of this myself. Right now I've got the true-Cool biggy cooler and a inline magnefine filter in the hot line from the trans.There isn't much room in the engine bay for a remote spin on filter. I have one on the old CJ for the 999 trans and like it alot.

 

[tacojeff]

How are you measuring the temp? I've found the scan gauge to read up to 50 degrees warmer than actual output in temps from the tranny. There was a thread referencing this issue just yesterday and for sure another one about 2 years before that.

 

[Unner]

How are you measuring the temp? I've found the scan gauge to read up to 50 degrees warmer than actual output in temps from the tranny. There was a thread referencing this issue just yesterday and for sure another one about 2 years before that.

Is this true that the scangauge measures that much higher? I've read the thread from a few years ago, but I thought the evidence provided seemed kinda thin, but I could be wrong. Can someone with a transmission temperature gauge and scan gauge verify this for us?

 

[drodandsrod]

I will post some pictures of the installation but I must stress in advance that my instal location is temporary. I installed the filter adapter in a snow filled parking lot and my choice of location placed a priority on minimizing my time under the vehicle (i.e. in the snow). I found a place on the fan shroud that put the filter out of harms way and was accessible from above. I'll hard mount it to the frame this summer. So that disclaimer in place, I'll get some pics up after work.

The temp sensor is built into the filter adapter housing. I plumbed the filter in so that I'm seeing the fluid temp as it leaves the trans and before it passes through the trans cooler. The gauge is an electronic unit provided in the kit by Derale, nothing super fancy but it looks nice enough.

 

[19963.4lsr5]

I have summit racings knock of of perma cools remote trans filter mounted on the CJ. It's got a temp port. I've looked at the Runner and only real place to put one is on passenger side inner fender way down low near frame rail.

 

[LittleCaesar]

I have summit racings knock of of perma cools remote trans filter mounted on the CJ. It's got a temp port. I've looked at the Runner and only real place to put one is on passenger side inner fender way down low near frame rail.

Let me take a pic of my B&M behind my front headlight tomorrow and post it for ya....

 

[poleclimber63]

I installed a in-line electrical tranny temp gauge in the output line from the tranny and have a True cool cooler mounted to the Rad, out front, several years ago. Last Spring after I did my engine replacement, I installed a second cooler next to it, as in the Summer, I tow the majority of the time and wasn't too happy with the towing temps. As my 4R is a 98, monitoring the tranny temp isn't possible with a scangauge.
Between Spring and Fall during normal driving (OD on), the gauge displays between approx. 140-180 Degrees. Climbing the mountain pass mid-summer with a fully loaded truck, I've seen 200 briefly. Towing my sport boat (OD off), however, it will usually run 140-200 degrees. One instance last Summer climbing a long hill towing the boat, I briefly observed 210 degrees. I run synthetic and replace the fluid every year. Before I installed the second cooler, my temps were typically 15-20 higher.
I believe the ideal operating temp is 160 degrees.... you run the fluid temp hotter you reduce the life span of the fluid--- running over 230/240 you breakdown the fluid and compromise the life of the transmissions' internal components. Hope this helps....