Changing ATF fluid level
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Postmaster
Joined: Jun 2005
Posts: 3,438
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From: New Hampshire
Changing ATF fluid level
Folks,
The other day i noticed my ATF level had slowly increased on my dipstick. I have an F250 7.3L with 4R100 tranny. After i run the truck for just a short drive the level returns to normal level for "cold" but when i leave the truck sitting in my garage for a couple of weeks it rises slowly to max level for "hot". Anyone seen this? Is it a problem? Any thoughts?
Thanks,
Jim
The other day i noticed my ATF level had slowly increased on my dipstick. I have an F250 7.3L with 4R100 tranny. After i run the truck for just a short drive the level returns to normal level for "cold" but when i leave the truck sitting in my garage for a couple of weeks it rises slowly to max level for "hot". Anyone seen this? Is it a problem? Any thoughts?
Thanks,
Jim
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,660
From: SE Florida
It's the torque converter slowly draining back into the pan. Some do it, some don't. There is a check valve that is supposed to prevent this, sometimes they leak a bit. It sounds like yours isn't leaking a lot, so if you don't mind the couple seconds it takes to refill the converter after sitting for a while it won't hurt anything.
I have seen them where the truck won't move for about 15 seconds after sitting for a day or two. That is a check valve that leaks a lot, and the torque converter drains down to the center.
I have seen them where the truck won't move for about 15 seconds after sitting for a day or two. That is a check valve that leaks a lot, and the torque converter drains down to the center.
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
Thats why they tell you to check the ATF when the tranny is warm and idling, so the TC is full. When I had a C6 in my truck, it wouldn't leak a drop when it was running, but if it sat for a couple days, the TC would drain into the case and fill it to a point where it could leak.
