4r100 shifting issues
Thread Starter
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4wd Low
Joined: Jan 2025
Posts: 12
Likes: 3
4r100 shifting issues
Hey all.
Been having some issues for awhile I hope I can finally get some answers
I have a 1999 f250 with the 7.3. And the 4r100.
about two months ago i did some maintenance and disconnect the batteries. They were disconnected for a couple days when i hooked back up I got the KAM code. Prior to disconnecting the transmission shifted beautifully. Afterwards im getting a 0782 code and a 0733 code. In my monitor it will tell me it shifted into third but it has not. To be able to shift into 3 I have to turn my over drive off. But for about 10 percent of the time it will shift fine. I hope I can finally fine some one out there that can give me answers. Because it shifted so good prior to battery disconnect. Thank you in advance
Been having some issues for awhile I hope I can finally get some answers
I have a 1999 f250 with the 7.3. And the 4r100.
about two months ago i did some maintenance and disconnect the batteries. They were disconnected for a couple days when i hooked back up I got the KAM code. Prior to disconnecting the transmission shifted beautifully. Afterwards im getting a 0782 code and a 0733 code. In my monitor it will tell me it shifted into third but it has not. To be able to shift into 3 I have to turn my over drive off. But for about 10 percent of the time it will shift fine. I hope I can finally fine some one out there that can give me answers. Because it shifted so good prior to battery disconnect. Thank you in advance
Thread Starter
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4wd Low
Joined: Jan 2025
Posts: 12
Likes: 3
The only thing I did was replace the intake boot and go over the intercooler tubes and turbo system for boost leaks. I dont know why I disconnected the batteries for that. Maybe had something else in mind that I never got to but checking boots and tubes were the only thing. I did.
Lead Driver
Joined: Jul 2017
Posts: 6,853
Likes: 2,331
From: WV
Reason for asking was the thought of “last touched, first suspect.” Is there any wiring nearby that you may have disturbed? Cruise control switch is close, but not sure how it could be related.
Are you sure it’s not going into 3rd? Many times people mistake TC lockup for a shift. Maybe it’s not going into lockup?
Just throwing out some ideas. Sorry for not being much help.
Are you sure it’s not going into 3rd? Many times people mistake TC lockup for a shift. Maybe it’s not going into lockup?
Just throwing out some ideas. Sorry for not being much help.
Thread Starter
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4wd Low
Joined: Jan 2025
Posts: 12
Likes: 3
I can feel the lock up in 2 and I still will climb past 2500 rpm with no shift into 3 unless I hit the over drive. Then once that hits 3 I feel the lock up again. Same with fourth. I have inspected every wire I could possibly find.
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4wd Low
Joined: Jan 2025
Posts: 12
Likes: 3
I changed the OSs and iss sensor this afternoon. If I start in over drive off I get to around 3000 rpm and it will shift to 3 hard and flash the od light. If I start with od on. It will get to around the same rpm hit 3 then 4 real quick with no od light flash
Lead Driver
Joined: Jul 2017
Posts: 6,853
Likes: 2,331
From: WV
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4wd Low
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
The codes say that it isn't going into 3rd when it should. It has codes for both no 2-3 shift and 3rd gear incorrect ratio. A torque converter problem CANNOT cause these codes.
Changing speed sensors is just a good way to waste money. They are not the cause. If they were you'd have a problem with more than just 3rd gear.
Disconnecting the batteries did not cause it. The 1999 7.3L had no adaptive learning, so that can't be cleared.
I'm leaning towards an internal trans problem that coincidentally showed up after disconnecting the batteries.
Changing speed sensors is just a good way to waste money. They are not the cause. If they were you'd have a problem with more than just 3rd gear.
Disconnecting the batteries did not cause it. The 1999 7.3L had no adaptive learning, so that can't be cleared.
I'm leaning towards an internal trans problem that coincidentally showed up after disconnecting the batteries.
Lead Driver
Joined: Jul 2017
Posts: 6,853
Likes: 2,331
From: WV
Originally Posted by Eagar95
I tried sending a video but it didn’t work you can see the monitor switch to 3 hear the lock up but goes all the way to 2800 with no shift was still in second
Tuned
Joined: May 2021
Posts: 363
Likes: 121
From: Montana
Also, you can disconnect the harness from the shift solenoids and see what happens. I can't remember exactly, but it shifts without the solenoid pack hooked up, like 2-4 or something. It can help rule out internal transmission failure vs solenoid pack problems.
It's also fairly easy to drop the pan, pull the shift solenoids and bench test them.
Tuned
Joined: Nov 2008
Posts: 499
Likes: 87
From: Oregon
The codes say that it isn't going into 3rd when it should. It has codes for both no 2-3 shift and 3rd gear incorrect ratio. A torque converter problem CANNOT cause these codes.
Changing speed sensors is just a good way to waste money. They are not the cause. If they were you'd have a problem with more than just 3rd gear.
Disconnecting the batteries did not cause it. The 1999 7.3L had no adaptive learning, so that can't be cleared.
I'm leaning towards an internal trans problem that coincidentally showed up after disconnecting the batteries.
Changing speed sensors is just a good way to waste money. They are not the cause. If they were you'd have a problem with more than just 3rd gear.
Disconnecting the batteries did not cause it. The 1999 7.3L had no adaptive learning, so that can't be cleared.
I'm leaning towards an internal trans problem that coincidentally showed up after disconnecting the batteries.