Transmission Temperature
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
You don't have to get your truck to a warmer temp if you don't want to. It's your truck.
As a transmission warms and cools it draws air inside due to expansion and contraction. This air contains moisture. Some of that moisture will condense (ever seen dew on the ground where you live? That's condensed moisture) and collect inside the trans. Water and untreated steel will cause rust. I've seen steel parts inside transmissions rust and pit from moisture that collected in the trans.
150°F will work better to drive off this moisture than 140°F. Getting it over 200°F once in a while works even better. But I'm sure you know better than I do. Continue with what you've been doing, it seems to work for you.
As a transmission warms and cools it draws air inside due to expansion and contraction. This air contains moisture. Some of that moisture will condense (ever seen dew on the ground where you live? That's condensed moisture) and collect inside the trans. Water and untreated steel will cause rust. I've seen steel parts inside transmissions rust and pit from moisture that collected in the trans.
150°F will work better to drive off this moisture than 140°F. Getting it over 200°F once in a while works even better. But I'm sure you know better than I do. Continue with what you've been doing, it seems to work for you.
On the flip side, in the summers I can easily see 180-190 on a hot summers day just driving around unloaded. Is that considered normal or on the high side? Thanks!
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,712
Likes: 2,638
From: SE Florida
There isn't a good way to warm up the trans other than driving it. You might consider covering the trans cooler with a piece of cardboard. The bypass on the side of the trans doesn't affect the warm up at all.
180-190 is normal.
180-190 is normal.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,712
Likes: 2,638
From: SE Florida
If you didn't mean it that way, I sincerely apologize. I felt mocked, and responded in kind.
Super Moderator
Joined: Aug 2008
Posts: 37,375
Likes: 1,860
From: Frederick, MD
180-190 is normal. That is good to know. Mine right now is running a bit cooler, I am sure because of the cold out there. What is the max (red line temp)?
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
Not to hijack the thread, but what is the purpose of the bypass?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,712
Likes: 2,638
From: SE Florida
220°F is the maximum continuous temperature. You can go to 250°F for no more than 1/2 hour.
The bypass is there to allow flow to the rear lube circuit if the cooler is plugged. If there is no flow to the rear the trans will burn up very quickly.
The bypass is there to allow flow to the rear lube circuit if the cooler is plugged. If there is no flow to the rear the trans will burn up very quickly.
Super Moderator
Joined: Aug 2008
Posts: 37,375
Likes: 1,860
From: Frederick, MD
Good to know I will set my alarms at 220F then so I dont cook the thing.
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