4r100 trans shift points
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More Turbo
Joined: Sep 2016
Posts: 580
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From: Michigan
4r100 trans shift points
I was out on the expressway today and got to the seed limit. Which was 75, and the tach in the truck was reading out around 2500. It felt like it wanted to shift soon but never did. I know a year after it was bought the dealer did a PCM reprogram. Would this be normal under any circumstance or do I have an issue? The truck is an '00 F-250. 7.3
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
Sounds like you never shifted into OD. TC locks up around 45-ish mph IIRC. Feels like a 5 speed as the shifts are 1 - 2 - 3 - TC lockup - 4(OD).
There's a former Ford transmission engineer on here that knows these things inside and out....@Mark Kovalsky. He could give you some insight.
There's a former Ford transmission engineer on here that knows these things inside and out....@Mark Kovalsky. He could give you some insight.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,714
Likes: 2,640
From: SE Florida
I was waiting to see if the OP answered what happened when he pressed the OD OFF button while at 75 MPH. Right now there isn't enough information to make any call.
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More Turbo
Joined: Sep 2016
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From: Michigan
No, I have not pressed the button. I may get a chance to get back on the expressway this Saturday so I can try it then. I remember the shift after 45. It was normal.
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More Turbo
Joined: Sep 2016
Posts: 580
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From: Michigan
Just a thought here, haven't been back on a go fast road yet, will be next weekend though. My third brake light doesn't work. I've heard people say things about that screwing up thing with the TC. Could that be part of my issue maybe?
Hotshot
Joined: Jan 2004
Posts: 19,760
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From: St Louis
On a 2000, it shouldn't matter if the CHMSL works or not. The PCM sees the BPP signal from the other half of the switch, not the half that runs the CHMSL and the regular brake lamps which are in parallel. Later models that require the bulb filament to "pull down" the otherwise open-circuit voltage at the PCM to a logical low state would be affected. That's also why later model speed controls don't work if the bulb is burned out or LEDs are swapped into the CHMSL.
In any event, if your CHMSL doesn't work, fix it. The vehicles behind you will appreciate it.
In any event, if your CHMSL doesn't work, fix it. The vehicles behind you will appreciate it.
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More Turbo
Joined: Sep 2016
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From: Michigan
Yesterday I was on the expressway, going to Roscommon, and there weren't any other people around so I hit the OD button at about 75 the truck immediately sent the rpms to 3000 maybe give a hundred. So I pushed it again and it dropped back to 2000 which is about where it ran the entire drive.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,714
Likes: 2,640
From: SE Florida
Yesterday I was on the expressway, going to Roscommon, and there weren't any other people around so I hit the OD button at about 75 the truck immediately sent the rpms to 3000 maybe give a hundred. So I pushed it again and it dropped back to 2000 which is about where it ran the entire drive.