Brand New Rebuilt E4OD Slipping In and Out of Third Gear Constantly - Ford Powerstroke Diesel Forum
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Old 11-20-2013, 09:00 AM
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Brand New Rebuilt E4OD Slipping In and Out of Third Gear Constantly

I just had my e4od rebuilt in my 1997 F350 4x4 because while on the freeway it began to slip out of third gear. It went into limp mode and I decided to tow it home rather than risk further damage. I reset the error code on the edge chip which took it out of limp mode and everything seemed fine. The code I got was p1728. I decided to rebuild it anyway because it had a lot of miles. The diesel shop did a heavy duty build with a billet torque converter, etc. They did a test drive three times and said everything was great. I drove it home and it immediately began slipping in and out of third gear constantly. So I shifted it into 2nd and all is well. But anytime it is in D, it slips in and out. I took it back and they took the pan down and found no issues. But they agree that something is wrong. Right now they are trying to figure it out, but I was hoping someone can give me direction. I think electrical because it is was fine immediately after the rebuild for their three test drives. Now I'm thinking a loose connection is somewhere only causing a problem now because it loosened up again.

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Last edited by Doctorsmack03; 11-20-2013 at 09:01 AM. Reason: So my 3rd grade English teacher doesn't roll over in her grave
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Old 11-20-2013, 08:12 PM
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More info...

The tranny shop says they tested the MLPS or neutral safety switch and all is well.
They replaced the solenoid packs, but the problem still remains.
They hooked the computer up to it and the signals coming into the trans are sporadic and really strange so they are wondering if that is the problem.
When the truck is running, they can unplug the transmission harness and the truck slowly dies.
When the truck is running they can force lock up and the truck immediately dies.

Here is some secondary info I thought may be relevant...
When I drove it home the other night, I noticed that when I stopped in my driveway with the truck in park, the idle lurched to 800 or so, then back to 700 like usual. It may be nothing or may be related.
I removed a banks trans command from the truck when I first got it. When it was originally installed, there were four wires or pins removed from the factory harness and relocated to a banks harness. Then the four empty slots on the factory harness were filled with four wires or pins from another banks harness. So basically the trans command intercepted four signals from the truck, injected them into the trans command and spit out its own 'upgraded' signals to the tranny. So I had originally installed a terminator plug that came with the trans command kit. It basically just had four wires looping to mimic the factory harness. When I removed the banks harness altogether I had to pull four wires or pins out of a banks harness and reinstall them into the factory plug. Maybe I crossed one, but I really really doubt it. Also, when I did that I found that the module that the factory harness plugs into on the passenger side of the transmission was flooded with fuel or oil, etc. That fuel or oil had decomposed the factory plug slightly so I had the transmission shop replace that plug while they were doing the work.
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