Dismiss Notice



Register Today It's free! This box and some ads will disappear once registered!

New 5R55S. The transmission slips.

Discussion in 'Transmissions & Transfer Cases' started by Christopher Runnells, September 20, 2019.

^^Searches ExplorerForum.com^^





  1. Christopher Runnells

    Christopher Runnells New Member

    Joined:
    September 20, 2019
    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    1
    City, State:
    South Jordan, Utah
    Year, Model & Trim Level:
    2008 Ford Explorer
    I have a 2008 Ford Explorer 6 cyl. 4.0L 4WD. Nine months ago I installed on my own a rebuilt 5R55S transmission. It ran fine until a few months ago when it started slipping intermittently. Here are the key points:
    • It slips mostly when it's warm and has been driven for a bit. Very rarely will it happen when the motor is cold and just started.
    • The slipping usually occurs after the car has been sitting idling for a few minutes, doesn't matter if it's in Park or if my foot is on the brake for a few minutes in stopped traffic. Also happens when I've parked the car for a few minutes and shut off the motor (like running quick into a convenience store). When I resume driving, the engagement takes a few seconds.
    • Another scenario: after driving at highway speeds, I slow down and stop at a light or stop sign, resume driving and it won't engage in the same manner.
    • When it finally engages and I can accelerate, it doesn't want to shift into higher gears. I have to let off the gas for a few seconds and try again, and then it will engage. Sometimes if I shift the transmission from Drive to 3 and then back to Drive, that seems to force it to engage and behave normally.
    • The symptoms only seem to happen once or twice per driving session. The problem usually corrects, and I can continue driving for a while and it won't slip anymore.
    • There is no leakage
    • I have checked the fluid level 3 times. The fluid level is correct, and no burnt fluid smells.
    • There is no engine light, no wrench light, no codes.
    • I have reset the computer a few times (disconnect the battery for 15 minutes and connect a wire between both battery cables). This seems to correct the problem briefly, but the symptoms come back.
    • The problem has not worsened over the course of a few months. Just the same behavior.
    I appreciate any help or advice I can get. I’m hoping it’s something minor that won’t require dropping the tranny again. I purchased it from a reputable parts dealer and installed myself.
     
  2. Support EF

    Join the Elite Explorers for $20

    Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no ads, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create more private Conversations, and more. Join Today. Your support is greatly appreciated.



  3. BrooklynBay

    BrooklynBay Moderator & long time member. Staff Member Moderator Elite Explorer

    Joined:
    November 11, 2005
    Messages:
    53,733
    Likes Received:
    400
    Trophy Points:
    113
    City, State:
    Brooklyn, NY
    Year, Model & Trim Level:
    88 89 93 95 96 Aerostars
  4. Christopher Runnells

    Christopher Runnells New Member

    Joined:
    September 20, 2019
    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    1
    City, State:
    South Jordan, Utah
    Year, Model & Trim Level:
    2008 Ford Explorer
    I used STP Mercon V, the transmission was warmed up, level, and idling in park while checking the fluid level. I used that same fluid on my previous transmission on the same car (TC blew out at 110k miles).
     

Share This Page







We Support Our Troops!