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1996 F Superduty Won't Stay in Third Gear

Discussion in '7.3L Powerstroke Diesels' started by Jeremy Barnhart, Sep 15, 2020.

  1. 79jasper

    79jasper Chickenhawk

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    That sounds correct. Was just curious what you were using.

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  2. Jeremy Barnhart

    Jeremy Barnhart Registered User

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    I checked the tps and the map and they both seem like they’re okay. I did pull the map sensor connector while the key was in the on position with the engine off and it threw a cel, so I turned it off and hooked up the forscan and turned the key back to the on position and the cel disappeared and forscan found no codes at all. Which seems really weird considering it just had a cel.


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  3. greenskeeper

    greenskeeper Full Access Member

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    hmm... rebuilt transmission... did it do it prior to the rebuild?
     
  4. Jeremy Barnhart

    Jeremy Barnhart Registered User

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    I bought the truck knowing that I would have to rebuild the transmission. The original had grenaded the planetaries. After I got the transmission fixed it worked fine until it didn’t. Someone else told me that maybe it’s a shifting solenoid that didn’t get replaced during the rebuild, but I don’t know.


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  5. greenskeeper

    greenskeeper Full Access Member

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    Were the lines flushed and cooler replaced when the transmission was redone?
     
  6. Jeremy Barnhart

    Jeremy Barnhart Registered User

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    Yes it was completely flushed and has a brand new cooler


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  7. trackspeeder

    trackspeeder Stone crusher.

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    You should get a stored code if the solenoid pack has failed.

    You could pressure test the tranny to see whats going on.
     
  8. Jeremy Barnhart

    Jeremy Barnhart Registered User

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    It doesn’t show me anything as far as codes. It even had a check engine light the other day because I unplugged the map sensor, but it didn’t record any codes. That seems weird to me but I have very little experience with these trucks so maybe it’s normal.


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  9. greenskeeper

    greenskeeper Full Access Member

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    Do you have a scanner capable of reading a PSD ?
     
  10. Jeremy Barnhart

    Jeremy Barnhart Registered User

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    I have the ELM327 with Forscan. It read the code that told me that the batteries had been disconnected the P0603. Other than that it it hasn’t shown anything.


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  11. greenskeeper

    greenskeeper Full Access Member

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    What happens when you manually shift the transmission from 1,2 D, and OD while accelerating. Does it hold each gear until you manually upshift?
     
  12. Jeremy Barnhart

    Jeremy Barnhart Registered User

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    It holds first and second only but when I shift into drive it will only actually go into third if I accelerate really hard and then let off of the throttle, but a soon as I hit the throttle again it shifts right back down into second. Since it's been doing this I've never gotten it into over drive.
     
  13. Noiseydiesel

    Noiseydiesel Full Access Member

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    Fords are absolutely notorious for the range selector switch. Also know as the neutral switch. Your E4OD is on the back of the transmission. A goofy shifting problem would make me look at that first.
    500 miles on a rebuild and a 99% chance the old switch was used. It could be simply out of adjustment and at least looking to see if the bolts are still tight might be a very good place to start.
     
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  14. Jeremy Barnhart

    Jeremy Barnhart Registered User

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    I'll check it out tonight and see. How difficult are they to replace if needed?
     

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