what is hot?
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Member
Joined: Oct 2005
Posts: 32
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From: Gods Country, Suscon Pa
what is hot?
I am in the process of installing a trans temp. gauge (not compleated yet) and i started to wonder what would be considered a hot trans temp?
most of what i read states what some one else runs nut not a hot temp.
with any luck I'll compleat the instalation next week. thanks for you help.
most of what i read states what some one else runs nut not a hot temp.
with any luck I'll compleat the instalation next week. thanks for you help.
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
There really is not a lot of good information as a search has shown.
There are temperature numbers tossed around, graphs etc but they never say where they were measured , how or under what conditions.
I did my research for the following max towing conditions for my F150 of 12,000 GVTW.
1. The max temps are seen in the output line from the converter to the radiator cooler.
2. The pan temps are much less useful.
3. Cooling can drop the return temp below the pan temp as the limit of cooling.
4. A deep alum pan with more fluid delays the rise in temp from cold starts.
This extra capacity still heats up an average of the same temp minus the alum pan heat dissipation for a net gain in cooling from the pan and extra fluid.
5. The max temps you see are dictated by how much load the transmission converter generates out of lockup.
6. The fluid breakdown temp needs to be a high consideration as to what is to high. Standard fluid is not very safe above about 250*. Full synthetic breakdown is upwards of 260+* so you need to consider this.
Temps out of the converter are the best place to see what conditions you are loading under. The pan is after the fact and the case is in the middle of the fluid circuit.
I have been in an ongoing project to modify my system as I tow at the 12,000 limit. Heat measurements in the outlet and return has shown things you won't find on an internet search. Currently I will be putting a gauge in the deep alum pan along with the output line now in use, to collect more data on how well the whole system is working.
Then there may be one more addition to reduce the pan temp feeding the transmission but I won't comment on it because no one has yet done it.
If my experience and detail proves helpfull then your ahead of the game.
For me, it's trying to keep the trans alive under the punsihment it gets but will still wear to a fault sometime. Presently at 65K on a 4r70w with syn blend Mercon V and changeout at no more than 10k miles.
There are temperature numbers tossed around, graphs etc but they never say where they were measured , how or under what conditions.
I did my research for the following max towing conditions for my F150 of 12,000 GVTW.
1. The max temps are seen in the output line from the converter to the radiator cooler.
2. The pan temps are much less useful.
3. Cooling can drop the return temp below the pan temp as the limit of cooling.
4. A deep alum pan with more fluid delays the rise in temp from cold starts.
This extra capacity still heats up an average of the same temp minus the alum pan heat dissipation for a net gain in cooling from the pan and extra fluid.
5. The max temps you see are dictated by how much load the transmission converter generates out of lockup.
6. The fluid breakdown temp needs to be a high consideration as to what is to high. Standard fluid is not very safe above about 250*. Full synthetic breakdown is upwards of 260+* so you need to consider this.
Temps out of the converter are the best place to see what conditions you are loading under. The pan is after the fact and the case is in the middle of the fluid circuit.
I have been in an ongoing project to modify my system as I tow at the 12,000 limit. Heat measurements in the outlet and return has shown things you won't find on an internet search. Currently I will be putting a gauge in the deep alum pan along with the output line now in use, to collect more data on how well the whole system is working.
Then there may be one more addition to reduce the pan temp feeding the transmission but I won't comment on it because no one has yet done it.
If my experience and detail proves helpfull then your ahead of the game.
For me, it's trying to keep the trans alive under the punsihment it gets but will still wear to a fault sometime. Presently at 65K on a 4r70w with syn blend Mercon V and changeout at no more than 10k miles.
Last edited by Bluegrass; Apr 13, 2006 at 08:44 PM.