OD light flashing, hard shift and slipping. NEED HELP WITH DD - Ford Powerstroke Diesel Forum
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Old 06-28-2014, 11:00 AM
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OD light flashing, hard shift and slipping. NEED HELP WITH DD

So I just bought a 1996 f350 not to long ago. The other day I was driving home from work and went to change lanes and speed up. When I did so it acted as if it was in neutral. Looked down and my OD light was flashing then I let off and coasted and it did it again. Then all of a sudden it stopped. Was fine for about 5 minutes then did it again but this time as the Rpms just really it it shifted extremely hard. I got to where I was going to check the fluid it wasn't low it's bright red. Couple hours later I had to drive home and it was perfectly fine. The OD light stopped flashing as well. Went to leave for work the next day and it acted as if it was in neutral again and shifted even harder but no flashing OD light. I'm new to the power stroke world and need some help as this is my daily driver.
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Old 06-28-2014, 06:41 PM
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Probably worth taking it to a transmission shop to pull codes, but that sounds like it may be getting towards "Needs a rebuilt" time.

The OD light flashing should mean there are codes to pull that will get you more detail on what, exactly, failed. But it sounds like bands aren't engaging properly.
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Old 07-02-2014, 12:16 PM
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E40D

I have a 95 F 350 with a rebuilt E40D about 5000 miles ago and never had any problems with it. The other day, though, I was headed up to the mountains unloaded at 45mph tranny temp at 145 EGT at 700 and my OD light started flashing. Had the code read and it said I had one silnode of the three on the modular dead. Getting a new modular on Monday. If I were in your shoes I would get the codes read also.
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Old 07-11-2014, 07:30 PM
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I had a rear brake/blinker bulb burnt out and when I hit the left tun signal (to accelerate and pass) the trans would drop out of 'torque converter lock up' and the engine would rev, though not like it was in neutral. This is very common with our truck and transmissions...brake bulbs, blinker bulbs, even the "third light" on the back of the cab, all affect these transmissions. LEDs in any of these positions have to have resistors. It's all about getting the torque converter unlocked to keep the engine running in a panic braking situation. Cheap thing to check.
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