Transmission, Slipping overdrive 2000 Excursion
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Transmission, Slipping overdrive 2000 Excursion
I have an unmodified 2000 Excursion 7.3. with 239000 miles on it. My transmission started to slip in overdrive. I could turn off the OD and it would run fine. I was in upper Wisconsin headed home to Georgia and figured the cold had something to do with it. Drove sixty mile with OD off turned it back on shifted fine and drove 750 mile to Paducah, KY stopped to eat and it started down the road and it slipped again. Drove 45 miles stopped added 8 oz of tranny fluid and it drove fine back to a friends house and after I dropped him off and headed home it started again. The tranny is serviced every year, new filter, drained torque converter. I use Amsoil Synthetic ATF. I have used the truck to tow a 10000lbs trailer over 65000 miles. I was not towing when this occurred. Any idea what is going on? I guess what I am asking is my tranny about to become toast or am I looking at something that can be fixed easily. IE. is it time to head to Lead Hill Arkansas?
Last edited by mrgman; Feb 17, 2013 at 04:23 PM. Reason: add more info
Post Fiend
Joined: Mar 2009
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From: Mt. Shasta California
Come on Mark, trans's slip when they are cold and it's OK?..........Mine operates fine below freezing and I don't even warm it up.
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From: Central Coast of CA
Actually, he didn't say it slips.
He said it can make it SEEM like it's slipping when it doesn't lock.
Stewart
Stewart
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Joined: Mar 2009
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From: Mt. Shasta California
Not buying it, how can it seem like it is slipping?, I think the OP has more than a cold trans problem.
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From: Isanti, MN
Mark certainly knows more than I do about these things, but mine will lock up when the trans gets above ~50°. I have a tough time thinking of a situation where the trans could stay that cold when travelling on the freeway.
To the OP, how do you know that its slipping? How does the transmission fluid look?
To the OP, how do you know that its slipping? How does the transmission fluid look?
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From: Central Coast of CA
It really doesn't matter if you buy it, believe it, or put it on a pedestal under a spot light and sell tickets for it. The OP described something the best way he could and based on that, Mark relayed info based on his experience with an explanation as to what might be happening.
Nothing more, nothing less.
Does that mean that's definitely what is happening? Nope. It's just one possible explanation based on the description posted by the OP.
Could there be something else going on? Sure! But without more info from the OP, it is what it is.
Stewart
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
What you're not understanding is that I said I don't think there is a slipping problem.
When the transmission is cold the torque converter does not lock. Many people that are not very transmission savvy confuse an unlocked converter with a slipping transmission. That's what I think is happening here.
Good questions! I should have asked that. And what are the answers? If the trans is really slipping it will show up in brown/black fluid in a very few miles.
Post Fiend
Joined: Mar 2009
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From: Mt. Shasta California
I jump on the freeway right away with no warm when it's 20* out and it doesn't remotely feel like slipping. Let's see what the OP has to say. Not buying the seems like slipping theory.
Elder User
Joined: Jan 2013
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From: Parker, CO
Whatever the actual mechanical problem is, there is obviously a problem. What the OP describes isn't normal. Ford didn't design their torque converter not to lock when its cold. I leave my house every morning here in CO and its well under 32 degrees (sometimes its 5 degrees) and there's no issue with the transmission so IMHO this isn't normal.
Now, one clue, he did say he uses synthetic Amsoil. I'd be curious about their temperature operating range vs the temps he's in right now. There are times when synthetic fluids can actually cause more harm than good if they are too slippery (non technical term). That said, I doubt he's below the operating temp range for Amsoil but worth checking none the less.
Its either an issue with the fluid level/condition (although he said he replaces it every year) or its an issue with the bands and clutches inside the transmission. The "good news" is that its OD that decided to act up and not the other gears. The bad news is that if its the trans internals, its only going to get worse.
We can all debate about the torque converter or the transmission internals or he could just take it to a trans shop and have them diagnose it. My vote is trans internals, most likely clutches slipping.
Now, one clue, he did say he uses synthetic Amsoil. I'd be curious about their temperature operating range vs the temps he's in right now. There are times when synthetic fluids can actually cause more harm than good if they are too slippery (non technical term). That said, I doubt he's below the operating temp range for Amsoil but worth checking none the less.
Its either an issue with the fluid level/condition (although he said he replaces it every year) or its an issue with the bands and clutches inside the transmission. The "good news" is that its OD that decided to act up and not the other gears. The bad news is that if its the trans internals, its only going to get worse.
We can all debate about the torque converter or the transmission internals or he could just take it to a trans shop and have them diagnose it. My vote is trans internals, most likely clutches slipping.
Post Fiend
Joined: Mar 2009
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From: Mt. Shasta California
You really like that saying, don't you?
It really doesn't matter if you buy it, believe it, or put it on a pedestal under a spot light and sell tickets for it. The OP described something the best way he could and based on that, Mark relayed info based on his experience with an explanation as to what might be happening.
Nothing more, nothing less.
Does that mean that's definitely what is happening? Nope. It's just one possible explanation based on the description posted by the OP.
Could there be something else going on? Sure! But without more info from the OP, it is what it is.
Stewart
It really doesn't matter if you buy it, believe it, or put it on a pedestal under a spot light and sell tickets for it. The OP described something the best way he could and based on that, Mark relayed info based on his experience with an explanation as to what might be happening.
Nothing more, nothing less.
Does that mean that's definitely what is happening? Nope. It's just one possible explanation based on the description posted by the OP.
Could there be something else going on? Sure! But without more info from the OP, it is what it is.
Stewart
Elder User
Joined: Jan 2013
Posts: 658
Likes: 0
From: Parker, CO
I'm not buying it.
TOTALLY KIDDING.
Just lightening the mood a bit.
Sounds like you're the best qualified to form some opinions based on what the OP said.
TOTALLY KIDDING.
Just lightening the mood a bit.Sounds like you're the best qualified to form some opinions based on what the OP said.
