Third gear slip...

Discussion in 'Generation 4 - Maintenance & Troubleshooting' started by Billy VK, Feb 10, 2020 at 8:37 AM.

  1. Billy VK

    Billy VK SHO Member

    Joined:
    Aug 18, 2018
    Messages:
    84
    Likes Received:
    82
    Gender:
    Male
    Location:
    Indiana
    Anyone else have the issue of the car seeming to glide in RPM in 3rd gear? Is this a known issue with these cars? Shifts firm from 1st to 2nd and 3rd to 4th and on up, but the car seems to float RPM without consistent pull in 3rd gear. I put an additive in it but doesn't seem to change anything for the better.
     
  2. FiveLeeter918

    FiveLeeter918 Ortiz Performance Sales Supporting Member

    Joined:
    May 22, 2017
    Messages:
    476
    Likes Received:
    491
    Gender:
    Male
    Occupation:
    Mechanical Engineer
    Location:
    Tulsa, OK
    Home Page:
    are you tuned? A lot of people have found that slightly overfilling the transmission helps as well.
     
    SHOdded likes this.
  3. Billy VK

    Billy VK SHO Member

    Joined:
    Aug 18, 2018
    Messages:
    84
    Likes Received:
    82
    Gender:
    Male
    Location:
    Indiana
    No tune.... I added Lucas trans treatment to bring the level up. It wasn't low and I remember reading that guys were doing that so now it is a half quart over I would guess.
     
  4. Juan C Renteria

    Juan C Renteria New Member

    Joined:
    Jan 19, 2020
    Messages:
    5
    Likes Received:
    5
    Gender:
    Male
    Location:
    Tucson
    My sho was doing this and it went away after reseting the "transmission variables" I think.. through forscan. Works like new again!
     
    SHOdded and Billy VK like this.
  5. ridered74

    ridered74 SHO Member

    Joined:
    Mar 27, 2015
    Messages:
    504
    Likes Received:
    586
    Gender:
    Male
    Neither of my SHO's did/do what you are describing.
     
    SHOdded and Billy VK like this.
  6. stripSHO

    stripSHO SHO Member

    Joined:
    Sep 9, 2019
    Messages:
    116
    Likes Received:
    72
    Gender:
    Male
    Location:
    Detroit
    I've experienced similar, only noticed when I short-shifted with the gas pedal buried. Not sure if it was an issue with the torque converter lock, clutch plate slipping, or simply me shifting to a point below the stall speed of the converter. Either way, I stopped doing that and have never had any sort of slippage since
     
    SHOdded and Billy VK like this.
  7. Billy VK

    Billy VK SHO Member

    Joined:
    Aug 18, 2018
    Messages:
    84
    Likes Received:
    82
    Gender:
    Male
    Location:
    Indiana
    I need to figure out someone with forscan in Indy. Thanks for the info.
     
  8. Johnbigdog

    Johnbigdog SHO Member

    Joined:
    Feb 17, 2017
    Messages:
    1,109
    Likes Received:
    1,319
    Gender:
    Male
    Location:
    michigain
    There is a transmission adaptive learn that you can clear separate of Keep Alive Memory.

    A battery disconect should effectively do the same thing.

    Any ford/lincoln dealership can also do the same thing.

    If you can look ad PID data Gear-Rat and Tran-rat will tell you if there is a forward gear slip. Gear rat is the pcm commanded gear ratio. Tran rat is what is measured through the transmission using the turbine shaft and output shaft speed sensors. If tran rat doesnt match gear rat after about 1 second of a shift you have a slip.

    I would bet a direct clutch system fault if 3rd gear is indeed slipping.
     
  9. Billy VK

    Billy VK SHO Member

    Joined:
    Aug 18, 2018
    Messages:
    84
    Likes Received:
    82
    Gender:
    Male
    Location:
    Indiana
    Well damn, I'll start with battery disconnect tonight and if that doesn't work, off to find a hook up at my local Ford dealership.
     
  10. SHOdded

    SHOdded SHO Member

    Joined:
    Dec 25, 2011
    Messages:
    8,445
    Likes Received:
    3,813
    Location:
    Maryland
    I don't think disconnecting the battery will clear the trans adaptive tables. Always have to service this separately from the KAM. Yes, Forscan Lite does have this service function for various vehicles, you will have to check if i is available for your specific MY and model. For some reason, they don't always have it available for all MYs of a generation.

    Also keep in mind the SSM that 6500rpm had published originally regarding a hardware issue inside the trans. Direct clutch was involved I think, as JohnBD mentioned. SM105K talks about it in his build thread also. Fingers crossed, it is not that.
     
    Last edited: Feb 16, 2020 at 4:54 AM
  11. luigisho

    luigisho SHO Member

    Joined:
    Nov 2, 2001
    Messages:
    9,177
    Likes Received:
    2,080
    Location:
    va beach,va
    Home Page:
    I found this to be true with my 14 f150. Tried to reset the tranny tables a few weeks ago with battery disconnect. Didn't seem to work. Maybe 30 min wasn't enough but I think maybe I need a software interface to clear it out.
     

Share This Page

If you wish to help keep SHOforum running, please click the donation button below