Tranny temp too low?
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Junior User
Joined: Oct 2004
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From: Jasper, IN
Tranny temp too low?
I recently installed a tranny temp guage in my truck and the guage never reads more than 125 deg., even after a sustained run. This is with no load, and it has been pretty cool around here lately. Does this sound right? Could the guage be wrong? I have read from other posts that the optimal operating temp is around 160 deg. If my guage is correct, are these low temps doing any damage to the tranny? I do have a tranny cooler installed also.
Thanks,
Joe
Thanks,
Joe
Elder User
Joined: Jan 2005
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From: Shawnee, Ks
Just normal driving I have never seen anything over 130 on mine, and thats going up and down a bunch of hills, nothing real steep I'm in Kansas after all 
I have not seen how it will do in lots of stop and go driving yet, but I have only had the gauge in for a couple weeks.
I have not seen how it will do in lots of stop and go driving yet, but I have only had the gauge in for a couple weeks.
Posting Guru
Joined: Aug 2004
Posts: 2,417
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From: Braham MN
Thats about where mine will run, If i drive on the highway or freeway for an hour then it will start to creap up to 160-170* range, but around town it ususally sits at 140*, but if I sit at a light with it in gear it will start to rise, fairly fast up to 180*, then right back down when we get rolling.
Heres a good thread about temps.
https://www.ford-trucks.com/forums/s...=360063&page=1
Diesel Rod
Heres a good thread about temps.
https://www.ford-trucks.com/forums/s...=360063&page=1
Diesel Rod
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Joined: Dec 2004
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I once asked my cousin, an engineer with GM, if it was harmful to operate an auto trans at too low a temp.
At this time, my brother was concerned because he had just rebuilt his E40D, added an external filter, a large cooler, and a deep, finned aluminum trans pan. When not towing, his temp was running in the 125 to 140 range, when towing it would go up to the 160 to 170 range.
His response - "not really". As long as the trans is allowed to warm up with the engine, it will be at a high enough temp to work fine. He said he has never heard of an auto trans dying from too low operating temp - they die from too high temperatures.
Is he right? I don't know, I'm not an engineer. But I am making sure mine doesn't overheat.
At this time, my brother was concerned because he had just rebuilt his E40D, added an external filter, a large cooler, and a deep, finned aluminum trans pan. When not towing, his temp was running in the 125 to 140 range, when towing it would go up to the 160 to 170 range.
His response - "not really". As long as the trans is allowed to warm up with the engine, it will be at a high enough temp to work fine. He said he has never heard of an auto trans dying from too low operating temp - they die from too high temperatures.
Is he right? I don't know, I'm not an engineer. But I am making sure mine doesn't overheat.
Thread Starter
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Junior User
Joined: Oct 2004
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From: Jasper, IN
OK. Thanks for all the responses guys. I guess I don't have anything to worry about! Sounds like I have a relatively healthy tranny.
Joe
BTW, Arninetyes- Can't help commenting on what you said about your cousin working for GM but owning a Ford, lol.
Joe
BTW, Arninetyes- Can't help commenting on what you said about your cousin working for GM but owning a Ford, lol.
Last edited by palajoe; May 2, 2005 at 03:36 PM.
