4R100 - overfilled = problem? - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 07-20-2010, 04:44 PM Thread Starter
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4R100 overfilled = problem?

I had the tranny fluid changed about 6K miles ago. a few days ago when i shifted into Reverse i had no Reverse. The trans temp gauge said about 150. I know there are issues with weak Reverse in the 4R100 (i've read about it here on the forum). I sat there a minute, tried Reverse a couple more times, and finally was able to get it to grab enough to ease it back. I saw a bit of fluid dripping from the back end of the tranny (not much). I had it examined by a mechanic, and he said the tranny was about a quart overfilled. He said the fluid came from the breather tube on top. He drained about a quart, and now the dipstick shows proper level at hot and cold. I'm an idiot for not asking about the high level of fluid on the stick previously.

I haven't been able to recreate the problem exactly, but i can still feel a little "shudder" in Reverse, especially if i'm backing up a slope.

Question: what's the danger with overfilling? I've read (here also) that overfilling can lead to foaming of fluid and loss of lubrication and cooling properties of fluid (due to being foamed up).

My fluid didn't smell burnt, and looks normal to me. I have an appointment with the Ford dealer in a week to have the tranny checked out. I still have a few months of warranty remaining.

Early 99 (7/98) F-350 CC 4X4 AT 7.3L 200K mi - 4" turbo back w/muffler - AFE Stage 2 - PMT1 ECM - DP 40T/DECEL/80E - dual trans coolers - HPX - Fuel CCK - Auto Meter Trans/EGT/Boost - 3.73 - stock tires

Last edited by samiam; 08-18-2010 at 05:51 PM.
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post #2 of 10 Old 08-17-2010, 07:23 PM Thread Starter
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almost 4 weeks and not a bite! btw i cancelled that dealership appointment and will reschedule it sometime in september. warranty runs out in october.

Early 99 (7/98) F-350 CC 4X4 AT 7.3L 200K mi - 4" turbo back w/muffler - AFE Stage 2 - PMT1 ECM - DP 40T/DECEL/80E - dual trans coolers - HPX - Fuel CCK - Auto Meter Trans/EGT/Boost - 3.73 - stock tires
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post #3 of 10 Old 08-17-2010, 07:26 PM
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when running, check the dipstick. should be on the top of hot when warm.


how many miles are on this 99?

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post #4 of 10 Old 08-21-2010, 01:12 PM
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Over filling is not a problem. I overfill every one that leaves my shop. As long as it's not over 1/2 inch above the full mark.
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post #5 of 10 Old 08-19-2019, 08:20 PM
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Originally Posted by ipz2222 View Post
Over filling is not a problem. I overfill every one that leaves my shop. As long as it's not over 1/2 inch above the full mark.
Does anyone know how full is too full? What actually happens when you're more than a 1/2 over?

I just needed to add fluid to my transmission and now I'm afraid that i might be 2 to 3 quarts overfull. Is that a big problem? Or is it ok? Do I need to pull the plug and drain some out? I just don't really want to do that becuase I know it will get pretty messy when I have to screw the plug back in while fluid is still pouring out.

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post #6 of 10 Old 08-20-2019, 06:24 AM
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2-3 quarts over justifies a fix

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post #7 of 10 Old 08-20-2019, 06:32 AM
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Overfilling will cause foaming of the fluid and the foaming during operation will decrease the cooling and lubricating efficiency.

This info is from Mark Kovalsky (trans engineer)


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post #8 of 10 Old 08-20-2019, 09:56 AM
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Quote:
Originally Posted by ZMANN View Post
2-3 quarts over justifies a fix
Quote:
Originally Posted by oilcan1001 View Post
Overfilling will cause foaming of the fluid and the foaming during operation will decrease the cooling and lubricating efficiency.
This info is from Mark Kovalsky (trans engineer)
Ahh... OK... This is the info I was looking for. Thanks guys.

I think I'm going to come up with some sort of big syringe, or some other kind of fluid extractor then. I just don't want to have to pull the drain plug and then have the fluid spray all over me when I'm only trying to drain out a couple of quarts.
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post #9 of 10 Old 08-20-2019, 10:21 AM
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i don't pull the plug all the way when i have to fix a fluid level issue

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post #10 of 10 Old 08-23-2019, 05:30 AM
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Not sure if it will work for the transbut you can try.
What I have done for engine oil when my drain plug gasket leaked after changing the oil is....... Hook a shop vac to the filler tube and turn on, then you can remove the plug and nothing will come out. Then you can try shutting off the vac for a few seconds at a time ( to let it drain) to try and remove some of the fluid.


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