Trans. Temperature?
Mountain Pass
Joined: Mar 2010
Posts: 183
Likes: 27
From: Northern CA
That can happen, but only well below 0°F. And we found that if the bypass opened from cold, thick ATF, it didn't close again until the ambient got quite a bit warmer. Once the cooler plugged from thick ATF it doesn't matter how hot the trans gets it won't force the cold oil out of the cooler.
Super Moderator
Joined: May 2004
Posts: 29,380
Likes: 118
From: Central Coast of CA
Stewart
Elder User
Joined: Feb 2006
Posts: 547
Likes: 0
From: Tennessee
Same with me. I also have a trans-go. Just towed a 7500 lb travel trailer from Destin, fl to Nashville. 62* ambient, 160* towing hard uphill all the way.
Cargo Master
Joined: Feb 2005
Posts: 2,837
Likes: 1
There are a few people on here who, moderator or not, have built such a reliable reputation that the expectations for what comes across their keyboard are so high that they may as well be our Powerstroke Messiah. I could start a list of names, but I won't. I guess what I'm getting at is that I agree with Stewart in that anytime there is a transmission thread we all refer the poster to Mark because he is our transmission expert. So would the aggravation of moderating the transmission forum really be any greater?
Elder User
Joined: Feb 2010
Posts: 721
Likes: 1
This is a great thread and I really appreciate you passing down your knowledge of transmission temp. to us Mark!
I have to ask about the use of transmission filters. I've been told that it's not a good idea to use a transmission filter because it actually lowers the transmission pressure and can actually cause damage to the transmission since it's not operating at the proper pressure.
Hopefully, Mark or someone else will be able to confirm or debunk this theory.
Thanks,
Drake
I have to ask about the use of transmission filters. I've been told that it's not a good idea to use a transmission filter because it actually lowers the transmission pressure and can actually cause damage to the transmission since it's not operating at the proper pressure.
Hopefully, Mark or someone else will be able to confirm or debunk this theory.
Thanks,
Drake
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
If you use a filter that has a bypass when it plugs it should be fine. If the bypass on the side of the transmission is removed I would NEVER install a filter in the line. If the filter gets restricted it will cut pressure to rear lube and the trans fails. If the bypass is in place and the filter gets restricted the bypass opens, the trans gets lube, but gets hot. You can stop before melting the transmission. Without the bypass the trans dies before you get any indication that something isn't right.
Senior User
Joined: Apr 2006
Posts: 157
Likes: 0
Mark,
last summer i had the local performance shop put in a new NADP Heavy Hauler transmission in my 02 F-350. The mechanic didnt put the temperature probe back in the tranny after the re/re and when i asked him, his answer was that where the probe was located on the drivers side just above the trans pan, it doesnt give you a 100% accurate reading. His suggestion was that i should look for a deep sump pan that is tapped to have the probe in the pan, and this will give me a more accurate reading. Id really like to hear your opinion on this.
I use the truck heavy, it has a 8'6"x9' steel deck with a full tidy tank most of the time and a 30' dually gooseneck with 10 000 lbs to 20 000 lbs on it. Usually run 30 000 + gross when hauling hay etc and on some tough hills. I want to make sure im monitoring my vitals correctly.
Cheers!
last summer i had the local performance shop put in a new NADP Heavy Hauler transmission in my 02 F-350. The mechanic didnt put the temperature probe back in the tranny after the re/re and when i asked him, his answer was that where the probe was located on the drivers side just above the trans pan, it doesnt give you a 100% accurate reading. His suggestion was that i should look for a deep sump pan that is tapped to have the probe in the pan, and this will give me a more accurate reading. Id really like to hear your opinion on this.
I use the truck heavy, it has a 8'6"x9' steel deck with a full tidy tank most of the time and a 30' dually gooseneck with 10 000 lbs to 20 000 lbs on it. Usually run 30 000 + gross when hauling hay etc and on some tough hills. I want to make sure im monitoring my vitals correctly.
Cheers!
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 24
From: Damon (South East Texas)
The PCM uses temp readings from the TFT sensor in the Solenoid Valve Body. These readings can be 15*-20* higher than those found from the Pressure Test port on the side of the trans. So in a sense, he is correct. I have a trans temp gauge sender in the test port and also monitor the TFT sensor readings with my Aeroforce Interceptor Scangauge. I tend to follow the higher reading and have my annunciator set to alert me if the temp rises above 200*. This is not a "danger zone" setting, but simply to let me know if things are heating up.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
From my testing the pressure port gives a more accurate reading than any place in the pan. The pan is the coolest part of the transmission. Depending on where you place the probe in the pan you can be 15 degrees or so different from another place in the pan, either higher or lower.
I do not recommend putting the sensor in the pan. If you want to know the internal temperature of the transmission the best place to do that is where the stock temp sensor is located, on the solenoid body. The next best place is the pressure port. The worst place to put it is in the pan.
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dinty01
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Jan 26, 2005 11:37 PM
