Engine/Transmission (1998.5 - 2002) How hot should transmission Temp Guage be??

[hammersley]

Ok I know this is a loaded ??? - BUT give me an idea:



1. Empty - warm outside say 80ish - idling in gear - where should the transmission temp get... .....



2. How hot will it get - empty - on a hot say 100 degree day going up a steep hill - or crawling around in teh back roads?????

 

[bmoeller]

If your sender is in the line, as mine is, I don't usually see over the 140* range empty. I have 4. 10s, so that could make a small difference. Pulling, haven't seen over 160*-180* range in O/D locked up. Have the stock transmission pan also.



With you having a DD pan, you probably would be 20*, or maybe more, cooler than mine.

 

[SEmerson]

140 should be about right running. Maybe a little lower. Ideing in gear will heat you up quick. But that also depends on you tc and vb. A stock vb will heat up faster. And a stock tc will heat up slower.

 

[azpete]

Mine runs about 165 with the outside temp in the 80's as long as I can keep moving. Alittle lower on the Interstate. In the City with one red light after another I'll approach 200 even shifting to neutral at the lights.



In the summer with temps above 100, loaded and some 8% grades I've seen 245. Will see this summer if the new Smart Controller makes any difference.



Not sure why but my temps seem alittle higher than most that I've seen posted.

 

[hammersley]

I was under the impression that 245 was getting pretty close to Dangerous - am I wrong???

 

[cosborne]

azpete,

I don't think youtr temps are too high... I'm about the same. Around town empty I see 160... but it I an in stop and go traffic or at a drive through, they will climb to 200-220 real quick. If I'm loaded and pulling a hill, I've pegged my guage (Lake Powell boat ramp, as posted in another thread) but according to Clint at ATS in Denver, this temp sender in the line is measuring super heated fluid coming out of the torque converter and has not yet gone through the cooler... so the pan temps will be much lower.

We had a long conversation about what the transmission is doing and where the best place for temp guages are... his opinion was that it should be in the pan to really see where your fluid temps are pre-converter... . all the in-line sensor is doing is telling you that the transmission is working real hard.



Now... . my guage is in the line and the ramp at Powell is almost 1/2 mile long, about 9-10% grade and boat boat weights around 6500lbs, outside temps around 70-80 lately.



This past weekend when pulling out, I put the transmission in manual "1" instead of "D". The temps didn't rise over 240... ... whereas in "D" the guage will peg out... .



Hope this helps... . I'm still trying to make sense of it all. .



I also have the MagHytec DD pan.....

 

[klaybus]

On the interstate at 60-70 my trans runs 110-120 in lock-up.



In stop & go traffic in town or on the interstate, 180 is common.



Pulling in HIGH TEMPS with a GCWR of 15k trans temp is 140-160 in lockup.



Backing the 5vr in the driveway or at a campsite in fluid coupling ..... Can see 220 fairly fast.



All of this is with my DTT transmission with a 89% TC. Best $$$ I've spent to date on my truck! Woof!



Clay



I should note... ..... My sending unit is placed in the line GOING TO the HEAT EXCHANGER.

 

[azpete]

Not too sure but I seem to remember a post at least a year ago that 265 in the outlet tube was the frying temp. I figure that if the fluid still looks and smells ok after some high temp pulls and change the fluid more often then it should be ok.



cosborne, if we don't get out of this drought real soon then that ramp will be a mile long and should be real fun to pull the boat out. Almost ready to sell mine because of no water. Will be coming up your way later this summer to Glennwood Springs with the ATV's and try out some of the high mountain trails.

 

[hammersley]

OK - my temp probe is in my Mag Hytech PAN - is there a difference in temps for my application?????

 

[SEmerson]

In the pan you can't get as hot as the line. Not sure what would be bad though. 300 will kill the fluid. If you ever get that hot in the line you need to change the fluid.

 

[azpete]

Found this post from Bill Kondolay which should give you what you are looking for. Hope it works, It's the first time trying to post a link.

 

[rweis]

I don't like over 200 so I am going to install a H7B before the water transmission heat exchanger. Mount it under the bed on pax side with a 1000 CFM fan and switch.



Going to do this in a week or so, will report back



(Thanks RustyJC for the idea of before the water heat exchanger)



Bob Weis

 

[hammersley]

Thanks - Bill's data is what I was looking for... ... ... .