Trans temps
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Trans temps
I was trying to pull a small building on a trailer (11 feet high on tailer, 8 feet wide) against 25mph wind and the most I could get is 40MPH. I would hold the pedal to the floor and the trans. would upshift to 3rd lock convertor, boost drops down to 8psi. Back off on the padal, trans down shifts, boost jumps but now I dont have the power to pull.
I've concluded its my trans. temp is dictating what shift pattern to select since my temps were hitting 210-220.
I've since added the biggest trans cooler I could find and on a 95 degree day my temps are running at 185 degrees at 65MPH running empty.
What temps are you guys running in the summer and what do you do during the winter, now I'm a little concerned about running my trans. to cold up in Canada.
Never had the problem till I put a hotter thermostat in my truck(190ish) compared to the 180ish I had and I think this new ECM I got has a different shift pattern in it which its suppose to have all the recent updates.
I've concluded its my trans. temp is dictating what shift pattern to select since my temps were hitting 210-220.
I've since added the biggest trans cooler I could find and on a 95 degree day my temps are running at 185 degrees at 65MPH running empty.
What temps are you guys running in the summer and what do you do during the winter, now I'm a little concerned about running my trans. to cold up in Canada.
Never had the problem till I put a hotter thermostat in my truck(190ish) compared to the 180ish I had and I think this new ECM I got has a different shift pattern in it which its suppose to have all the recent updates.
Fleet Owner
Joined: Aug 2004
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From: AZ
I'm run about 100* above the outside temp pulling the 5er in my signature. The rest of your post I'm not sure about, if you changed computers then maybe your shift points were changed compared to the other computer.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
If the problem started with the hotter thermostat, don't you think maybe the hotter thermostat is the cause of the problem? Maybe it would be a good idea to go back to the stock thermostat? Maybe there is a reason for the stock thermostat temperature?
Posting Guru
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From: West Texas
The stock thermostat should be a 193 or 195. That's not the problem. I can tell you though from pulling big loads in high winds a lot down here that that head wind will jack the temp real bad. Even on my 5 speed it does. I have to get off of mine when it reaches 180 degrees. Old school navy engineer thinking. Normally it only runs about 120 to 140 till I get into a nasty wind. Then it will climb to 180 pretty quick. That's pretty darn hot for a 5 speed.
Hotshot
Joined: Feb 2009
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From: Plankinton, SD
That is running hot for some reason. Mine was running 190 the other day, 90 degrees outside with my 48' trailer on. Not real windy, but still, you're running hot for some reason. Have you checked for a blockage in the cooler lines?
Thermostadt won't have anything to do with that. Mine had a 182 in it when I changed the pump and stadt, put a 195 in it.
Thermostadt won't have anything to do with that. Mine had a 182 in it when I changed the pump and stadt, put a 195 in it.
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I'll have to try blowing out the trans. line or maybe increasing the size.
As for the gauge, it was reading 195 degrees and the sender is in the test port and if I recall you add 20 degrees to what the gauge is reading for the transmission.
I know I've run hot in the past with a cooler thermostate but was working the trans. real hard at low speeds but afterward never expearanced the stupid up shifts when hitting the highway till this last time when I encountered the problems.
I checked my trans. cooler plumbing, its going transmission to rad cooler to air cooler back to transmission. Does that sound right???
As for the gauge, it was reading 195 degrees and the sender is in the test port and if I recall you add 20 degrees to what the gauge is reading for the transmission.
I know I've run hot in the past with a cooler thermostate but was working the trans. real hard at low speeds but afterward never expearanced the stupid up shifts when hitting the highway till this last time when I encountered the problems.
I checked my trans. cooler plumbing, its going transmission to rad cooler to air cooler back to transmission. Does that sound right???
Hotshot
Joined: Feb 2009
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From: Plankinton, SD
Cooler plumbing sounds right. I'm not sure I understand where you have the gauge reading from. Drivers side of the trans above the pan rail is where it should be hooked up, if it is, that reading should be right. That temp is correct if that is where your sensor is. If so, you may have other issues.
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
Why do you add 20°? Is your gauge wrong?
That is right.
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
No, it is not. The five speed can run A LOT hotter than that with no problems.
Fleet Owner
Joined: Aug 2004
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From: AZ
When you added the trans cooler did you put in the thermastat? Mine ran hot with it and took it off. Another time I added it back in because of long warm up times and it ran hot again. I got rid of it and don't have hot temps anymore. Mine is either defective or something.
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Cooler plumbing sounds right. I'm not sure I understand where you have the gauge reading from. Drivers side of the trans above the pan rail is where it should be hooked up, if it is, that reading should be right. That temp is correct if that is where your sensor is. If so, you may have other issues.
Thats the port I was referring about
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Always thaught to add 20 degrees because that is not your peak out temp. of the trans cooler line...........
If what I'm reading then off the gauge is correct then I'm better then I thaught then.
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When you added the trans cooler did you put in the thermastat? Mine ran hot with it and took it off. Another time I added it back in because of long warm up times and it ran hot again. I got rid of it and don't have hot temps anymore. Mine is either defective or something.
No thermostat............
I think I will bring in my truck to get the ECM flashed, I drove my truck all weekend no hotter then 75 degrees and my temps did not go beyond 145 degrees and shifted fine.
All my problems seem to stem from the new ECM I installed late last summer, I noticed from the get go that the transmission down shifted a lil sooner the day it was installed.
The day I was having trouble pulling the harder I pulled WOT with it in 3rd converotr locked the hotter the engine got, the faster my trans. gauge climbed and the worse the trans. got when it came to upshifting.
I ended up unhooking the trailer that day and got my friends dodge cummins to pull the building with performance injectors, turbo, exhaust and a chip and his engine temps. were a neddle below the red on his engine temp gauge. He actaully had to run his cab heater to help it keep it cool.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
The peak temperature going to the cooler is anywhere from the same temperature to 100°F or more higher than that. Don't worry about that peak temperature, it really doesn't mean much at all. That's why there are two coolers on the truck.
Fleet Mechanic
Joined: Aug 2007
Posts: 1,508
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From: The boonies by Dallas OR
So if the original owner plumbed the temperature gauge into the line to the cooler, what temperature would you let that get to before you got nervous?
It was at 240°F on the gauge when the original front seal gave out.
It was at 240°F on the gauge when the original front seal gave out.