trans temp guage question
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Senior User
Joined: Jul 2009
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trans temp guage question
hello all i have a problem or what i think is a problem with my new guage. i drove for 20-30 miles empty so far all at once and the guage reads only 110-120 degrees does that seem right. half at 35-45mph other half at 55-60 mph does that seem right or is the sensor not right on a 70 degree day. i have a new transmission with 8000miles on it with mercon v a upgraded oem 7.3l cooler little bigger than what came in it and had to get it for fords warrenty and a aftermarket derale inline cooler. it just doesnt ssem right seems really cold to me and the stock guage reads normal fast like 3 miles but that doesnt help cus there crap. what do you all think?
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
Those temps seem on par with a healthy trans, here's some info on the stock "idiot" gauge
dieselmann's editorial
dieselmann's editorial
Post Fiend
Joined: Feb 2008
Posts: 10,977
Likes: 5
From: Lancaster, Pa.
Once you added that Derale inline cooler to the mix you are going to see even more of a reduced temps in your tranny. On 90* plus degree days running at operating temps I've never seen above 150*-160*. Sounds good here..
Laughing Gas
Joined: Mar 2004
Posts: 789
Likes: 16
From: West Coast/L.A. Area
Those temps seem on par with a healthy trans, here's some info on the stock "idiot" gauge
dieselmann's editorial
dieselmann's editorial
I wish I could remember where I saw a chart that showed you what happens to the life of your trans fluid as you get to 200. All I remember is you don't want to be there.
Last edited by GEugeneS; Aug 13, 2011 at 10:49 AM. Reason: spelling
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,705
Likes: 2,626
From: SE Florida
Don't bother with that chart. It's a flat out lie.
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Molon Labe
Joined: Dec 2006
Posts: 5,272
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From: Alaska
I agree. If it were true, there wouldn't be very may transmission shops up north...
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Laughing Gas
Joined: Mar 2004
Posts: 789
Likes: 16
From: West Coast/L.A. Area
I see you worked on them. So what is a safe temp to run them at and where does the fluid start breaking down?
Laughing Gas
Joined: Mar 2004
Posts: 789
Likes: 16
From: West Coast/L.A. Area
That's good to know. Guess I wasted some $ on the Tru-cool.
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