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??
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 ?
Last edited by f=2504by497; 12-28-2003 at 07:39 PM.
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.
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.
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.