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[5R55S] No Reverse | Can't Take Off In 'D'

Discussion in 'Transmissions & Transfer Cases' started by OfficialSmudge, February 1, 2018.

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    1. OfficialSmudge

      OfficialSmudge New Member

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      Year, Model & Trim Level:
      2007 Explorer XLT
      I have a 2007 Ford Explorer RWD 4.0L v6. This problem started very suddenly. Here's the description of my problems right now...
      I cannot use reverse. Shifting in to 'R' will jerk the vehicle back just slightly. It feels like it just barely catches if I really rev it up, but hardly enough to move.
      The same thing happens if I try to take off in 'D'. However, I can shift in to 1st, 2nd, or 3rd to take off (and they all work correctly). Once the vehicle is moving fast enough for 4th gear, I can shift it in to 'D' but O/D must be OFF. Once it's moving faster yet, I can turn O/D ON. If I slow down too much (say <25mph) it will come out of gear, and I must manually select a lower gear again.
      The problems started very subtly and intermittent at first, but over the course of over a month, it had come to this state.

      I tried putting in Lucas Oil Transmission Fix with no luck. No engine codes, unless I really let it slip, but then it only throws P1700 (I think that's right), I guess indicating that the input speed and output speed are mismatched given the targeted gear.

      I've heard of this exact problem from another user (describing it as "no reverse or auto function"), but they didn't really mention what exactly was broken. I know I'll probably have to get this rebuilt by a professional, but I thirst for knowledge. I understand this transmission somewhat well, but I don't know what could cause this. It absolutely boggles me that it will go into 1st perfectly if I shift manually, but it will not move if I try to take off in D. I originally though that was an electrical issue because the problem got much worse the day a lot of ice melted under the truck. Please let me know what you think, I'd love to know what wrong with this thing. Thanks!
       
      Last edited: February 2, 2018
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    3. corkey

      corkey Moderator Emeritus Moderator Emeritus

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      Elite Canuck,multiple ifs offender,, and musky maniac,, i wheel and i fish,,
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      99 xls,96 xl,91,08 Ranger
      needs to come out,, it's done,, broken band in the trans

      look around wrecking yards for another,,
      find one that was in a crash , but not bad enough to break the trans,, that way you know it was being driven before it came to the yard,,
       
    4. OfficialSmudge

      OfficialSmudge New Member

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      Would that explain why it goes in to the lower gears manually, but not automatically? The reverse problem was intermittent at first, but now seems permanent. Would the reverse band break in such a way that it would cause intermittent problems to begin with? Thanks for the response!
       
    5. OfficialSmudge

      OfficialSmudge New Member

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      I finally found some information on this exact problem. It's the overdrive sprag. According to JK080 (Transmission Moderator) on another post:
      Might attempt this one myself.
       
    6. Tech By Trade

      Tech By Trade Well-Known Member

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      Change the fluid before you do it. that lucas garbage will cause nothing but problems.
       
    7. JK080

      JK080 Transmission Moderator Staff Member Moderator Elite Explorer

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      I was about to post about the sprag failure but looks like you found it already. Its most likely what you are dealing with also.
       
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    8. Jgoode5674

      Jgoode5674 New Member

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      How much will this issue cost to repair? I’m not good with complex auto issues, so wouldn’t want to attempt this. At a shop, about how much to fix the spray? Mine is doing exact same. A 99 explorer, it’s a great vehicle, but out of no where this started
       
    9. JK080

      JK080 Transmission Moderator Staff Member Moderator Elite Explorer

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      Hi Jgoode5674, the cost will be up to the shop that does the repair.

      They will want to rebuild the whole thing rather than just fixing the sprag assembly. I would expect the 5R55E somewhere between 2k to 2.5k to do it right and have a decent warranty.
       

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