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Old 12-28-2003, 06:13 PM
tileflyer tileflyer is offline
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97' F250 HD overdrive light flashing?

I was coming home today and as I left the stoplight my truack starting shifting fast and hard into the gears.Then the overdrive light started flashing on the shifter.What would cause this and is it an expensive fix??
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Old 12-28-2003, 06:32 PM
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which trans?engine, miles? count the flashes too,watch seq.this happened on my 95 5.0 eaod at about 200,000 i just cleared the code, and it never showed up again,a fluke i guess, any differance in driveability ?

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Old 12-28-2003, 07:06 PM
Clubwagon Clubwagon is offline
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The OD light flashing indicates a transmission DTC (diagnostic trouble code) has been set. It will flash continuously so counting is of no reference.

Shifting hard is what the transmission does when in "failure management mode". It raises the line pressure to max in an effort to lock the clutches up as hard as possible to reduce slip. The hard shift is a byproduct of that.

There is no way of knowing what is wrong until you read the codes. It could be as simple as a bad speed sensor or as expensive as a major internal problem requiring an overhaul.

Most '97 F250s will have an 4R100W (E4OD) but there are a few around that have the 4R70W (AODE) in them.

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Old 12-28-2003, 07:11 PM
tileflyer tileflyer is offline
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1997 7.3 Powerstroke ,not sure of what tranny and it has about 130,000 miles on it. It has never done much towing at all and the tranny fluid is full and looks brand new still.It was last changed at about 70,000 miles.
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Old 12-28-2003, 07:12 PM
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if you clear the code, it should,show backup, if its a real problem right, ,clubwagon? this happen to me driving to cali.
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Old 12-28-2003, 07:13 PM
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Just to add to it,yesterday while on the interstate,I noticed everytime I engaged the cruise control,the engine would speed up about 5-10 mph until the cruise took effect.
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Old 12-28-2003, 09:23 PM
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It could be a random thing. That happens sometimes. A shop will typically verify by clearing it and driving it again to see if it returns.

Each DTC has a certain set of conditions that must be met before it will set. So depending on the code and the required conditions it may come back right away or take a while. You can clear the codes by disconnecting the battery for a few minutes.

If the cruise is behaving strangely, then it could be a speed sensor problem. You need to see what the code is.

Oh, and any diesel in recent truck will have a 4R100W (E4OD) in it.

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Old 01-14-2004, 04:29 PM
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shifting hard wont hurt trasmission in short terms?

i got exactly same problem with my 96 f-250 4x4 long cab. OD light flashing and shifting hard but all working ...

next week i will take my truck to the dealer
and post a followup on the resolved problem
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Old 01-14-2004, 06:10 PM
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I fixed the problem with this
Click the image to open in full size.

A 2002 F-350 Lariat crew cab with a 4" Pro-Comp lift and 315 BF- Goodrich tires.This truck has every available option from Ford,and a Powerstroke ,of course! And what a better ride than my 97' F-250
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Old 01-14-2004, 06:10 PM
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1999, 4r100w, 96, 97, axle, f250, f350, flash, flashing, ford, lacation, light, overdrive, powerstroke, sensor, speed

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