Tranny fluid temp
Postmaster
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From: Monroe/Ellensburg, WA
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
If you have a transmission built in the 60's that chart is very useful. If you have a newer trans ignore that chart. It's WAY out of date.
Normal temps are 60-100°F above ambient when unloaded. Loaded is hard to predict, but your maximum steady state temperature is 220°F. You can go to 250°F for no more than 1/2 hour with no damage.
Normal temps are 60-100°F above ambient when unloaded. Loaded is hard to predict, but your maximum steady state temperature is 220°F. You can go to 250°F for no more than 1/2 hour with no damage.
New User
Joined: Feb 2010
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From: Northern Minnesota
any idea what the tranny line pressure should be. I have an Edge Evolution programmer with "real time" diagnostics including rpm, engine oil temp, tran. fluid temp, trans. line pressure, exh. back pressure. etc. My truck has been cruisin around with tran. line pressure 55-70 uphill and in teh 30's on the freeway. Didn't think it ever ran that high before. Any Idea?
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
That sounds about right to me.
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Postmaster
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From: Levittown
Where does this 60-100*F above ambient come from?
This is saying that its ok for the fluid to be 60*F if ambient
is 0*F? Is it true a code set for overheat in a E4 and 4R is
270*F?( at the pack)
I have used 180 to 230*F for years (min/max)
at the pressure port. Most thermo valves are set to flow
at 180*F.
.02
Bill
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Fleet Mechanic
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From: The boonies by Dallas OR
Unless you're running the original front seal 
Mine went at 240°F. The front seal has been replaced and I've got 185K on the original E4OD.
Mine went at 240°F. The front seal has been replaced and I've got 185K on the original E4OD.
Frmr Ford Trans Engr
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From: SE Florida
From observing many trucks.
OK or not, that's what is going to happen.
Yes, that's true.
Neither the E4OD nor the 4R100 have a thermo valve from the factory. There is a pressure bypass, but it does not have a thermo element in it.
OK or not, that's what is going to happen.
Neither the E4OD nor the 4R100 have a thermo valve from the factory. There is a pressure bypass, but it does not have a thermo element in it.
Postmaster
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From: Levittown
My comment was about aftermarket coolers with bypass stat.
Fluid temp helps control water in the system.
I have seen rusting and pitting of parts from running it to cold.
.02
Bill
Fleet Mechanic
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From: The boonies by Dallas OR
I'm wondering if I should put a T-stat on. The original owner of my truck put a MASSIVE cooler on. In the summer it is great and save for backing a 15K lb trailer it stays under 180.
But in the winter time I don't often tow and it stays cool. I do occasionally cook it up to 180.
But in the winter time I don't often tow and it stays cool. I do occasionally cook it up to 180.
Hotshot
Joined: Feb 2009
Posts: 10,408
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From: Plankinton, SD
I've got a thermal bypass that came with the big trucool cooler I got. It's used just for warming up the tranny in the winter. From what I've read from these guys a tranny too cold is about as bad as too hot.
Whether you guys care or not my 97 just had the 5/16 lines on it.
Whether you guys care or not my 97 just had the 5/16 lines on it.
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From: North East Ohio
Mark,
Have you found any temp distinction between a sender in the pressure port vs a probe mounted in the pan?
Have you found any temp distinction between a sender in the pressure port vs a probe mounted in the pan?
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