4r100 shifting issues.
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4wd Low
Joined: May 2020
Posts: 12
Likes: 1
4r100 shifting issues.
So I have an 2002 F450 v10 4x4.
I’ve been getting some noises from the front on the transmission under heavy load. It’s sounds like a rattle or grinding. What has my stumped is it only does it when I put my foot in the petal and it down shifts. Under normal driving no sound and no rattle from front of trans sitting at idle.
Anyone have any idea where to start?
Filter and fluid are new and didn’t find any thing unusual in the pan or magnet. Start to wonder if I have a sensor going out somewhere not engaging things when I stomp on it.
Thanks I’m advance for any help.
Michael
I’ve been getting some noises from the front on the transmission under heavy load. It’s sounds like a rattle or grinding. What has my stumped is it only does it when I put my foot in the petal and it down shifts. Under normal driving no sound and no rattle from front of trans sitting at idle.
Anyone have any idea where to start?
Filter and fluid are new and didn’t find any thing unusual in the pan or magnet. Start to wonder if I have a sensor going out somewhere not engaging things when I stomp on it.
Thanks I’m advance for any help.
Michael
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,738
Likes: 2,667
From: SE Florida
So what shifting issues do you have? The title says shifting issues, but you haven't mentioned any shifting issues.
We can rule out sensors if you check for codes. Any sensor problem will set one or more codes.
If the trans isn't engaging it will totally fail in 1-2 miles, so I really don't think that is your problem. I suspect there is something loose, like the cover on the lower front of the trams, that is causing the noise.
We can rule out sensors if you check for codes. Any sensor problem will set one or more codes.
If the trans isn't engaging it will totally fail in 1-2 miles, so I really don't think that is your problem. I suspect there is something loose, like the cover on the lower front of the trams, that is causing the noise.
Thread Starter
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4wd Low
Joined: May 2020
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Mark,
so today I took it on another drive. If I’m easy on the throttle the. It runs through the gears fine with no noise. If I get going down the highway and romp on it. It’s wants to down shift, rpm’s jump high, I get a rattling sound from down by the 4x4 shifter and the truck acts like it has no power.
Before I got it it was a county plow truck so I’m sure it was abused. I know my way around an engine very well but not so versed in the transmission dept. Just figured I’d pick so brains on here before I take it to a shop and spend a ton of money.
so today I took it on another drive. If I’m easy on the throttle the. It runs through the gears fine with no noise. If I get going down the highway and romp on it. It’s wants to down shift, rpm’s jump high, I get a rattling sound from down by the 4x4 shifter and the truck acts like it has no power.
Before I got it it was a county plow truck so I’m sure it was abused. I know my way around an engine very well but not so versed in the transmission dept. Just figured I’d pick so brains on here before I take it to a shop and spend a ton of money.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,738
Likes: 2,667
From: SE Florida
I'm going to guess that something may be wrong somewhere. Without any codes to work with that's as specific as I can get. But if it has no power that's usually an engine problem, not a trans problem.
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4wd Low
Joined: May 2020
Posts: 12
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Thanks mark. I’ll update this weekend got a buddy bringing over his nice snap on scan tool. I got a cheap one off Amazon so it doesn’t give me any real info or live data. Hopefully we can dig alittle deeper in the computer with his.
Thank for your help so far.
Michael
Thank for your help so far.
Michael
Thread Starter
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4wd Low
Joined: May 2020
Posts: 12
Likes: 1
Mark,
got it on the scanner today while looking at transmission values I noticed the actual turbine shafts speed in park reads but if I give it some throttle it drops to 0 Rpm’s also while driving once I get into highway speed or possible overdrive it goes to O rpm’s once again. It picks back up once it shifts down. Not sure why it would do that.
got it on the scanner today while looking at transmission values I noticed the actual turbine shafts speed in park reads but if I give it some throttle it drops to 0 Rpm’s also while driving once I get into highway speed or possible overdrive it goes to O rpm’s once again. It picks back up once it shifts down. Not sure why it would do that.
Thread Starter
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4wd Low
Joined: May 2020
Posts: 12
Likes: 1
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4wd Low
Joined: May 2020
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Tried to upload video and can’t but my input shaft speed and turbine shaft speeds. Will drop to zero when I rev it up in park. Seems to read correctly until I’m in over drive then the Value ‘ Actual Turbine Shaft speed drops to 0 and stays that way until it drops out of overdrive.
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