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High Rpm....low speeds

Discussion in 'Ask An Owner Operator' started by trucky909, Sep 20, 2020.

Page 2 of 11
  1. Sep 20, 2020 #11
    abyliks

    abyliks Road Train Member

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    ludlow MA
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    Are we sure those are the actual speed or could the speedo be off from Messing with the trans, usually when a truck is specd with 2.xx rears it’s specd with a direct drive trans anyways because the bean counters think they can save half a cent a year on fuel that way
     
    abyliks, Sep 20, 2020
    abyliks, Sep 20, 2020
    #11
    singlescrewshaker Thanks this.
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  3. Sep 20, 2020 #12
    bad-luck

    bad-luck Road Train Member

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    Where are you located?
     
    bad-luck, Sep 20, 2020
    bad-luck, Sep 20, 2020
    #12
  4. Sep 20, 2020 #13
    trucky909

    trucky909 Light Load Member

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    Yes this is the same issue. Transmission and clutch have now been pulled. Not sure how you're suggesting that the transmission was swapped.

    Transmission was not swapped, otherwise I probably would've had this issue earlier than 3 years of having the truck without having this issue. This issue existed prior to having a new clutch put in....that's the only time someone would've touched the transmission.

    I can have the mechanic check everything you've mentioned and see if he can find something. As far as ratios and calculator....I'll probably have the mechanic do all of that.

    Thanks for the suggestions
     
    trucky909, Sep 20, 2020
    trucky909, Sep 20, 2020
    #13
  5. Sep 20, 2020 #14
    AModelCat

    AModelCat Road Train Member

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    Did you not state in your other thread that the transmission was swapped out and the incorrect transmission model was installed as per the tag?
     
    AModelCat, Sep 20, 2020
    AModelCat, Sep 20, 2020
    #14
    Dino soar and singlescrewshaker Thank this.
  7. Sep 20, 2020 #15
    AModelCat

    AModelCat Road Train Member

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    Straight from your previous thread:
     
    AModelCat, Sep 20, 2020
    AModelCat, Sep 20, 2020
    #15
    Dino soar, daf105paccar and singlescrewshaker Thank this.
  8. Sep 20, 2020 #16
    trucky909

    trucky909 Light Load Member

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    No....this is what other people was suggesting regarding the issue. I never put another transmission in. People were saying that its possible the transmission was swapped on the clutch job I did without me knowing. I even had 2 other mechanics tell me that. Its a direct transmission with no overdrive....not sure if that's the issue.
     
    trucky909, Sep 20, 2020
    trucky909, Sep 20, 2020
    #16
  9. Sep 20, 2020 #17
    trucky909

    trucky909 Light Load Member

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    Oh....lol this will show you how slow i am. I was actually checking the plate on the differential...not the transmission. Another mechanic checked the right area and had the right info on the transmission.I gotta delete that post. Sorry
     
    trucky909, Sep 20, 2020
    trucky909, Sep 20, 2020
    #17
    singlescrewshaker and AModelCat Thank this.
  10. Sep 20, 2020 #18
    abyliks

    abyliks Road Train Member

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    ludlow MA
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    , have you gps verified the speedo is correct? Because a clutch swap will not change rpm/speed but they might of done something with the sensor, a different trans, rears or tire size are the only way to change speed/rpm
     
    abyliks, Sep 20, 2020
    abyliks, Sep 20, 2020
    #18
    singlescrewshaker Thanks this.
  11. Sep 20, 2020 #19
    AModelCat

    AModelCat Road Train Member

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    My suggestion would be to record your road speed at say 1500 in each gear. Then take the model number off your transmisson. Go to Eaton's website, download the manual for the transmission and look up each gear's ratio. Plug all that info into a road speed calculator for every gear ratio and see how it compares to what you're actually seeing. Maybe have someone in another vehicle pace you and see if your speedometers match as well.
     
    AModelCat, Sep 20, 2020
    AModelCat, Sep 20, 2020
    #19
    Rideandrepair, Swine hauler, singlescrewshaker and 1 other person Thank this.
  12. Sep 20, 2020 #20
    trucky909

    trucky909 Light Load Member

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    Yeah the GPS is verifying speed correctly
     
    trucky909, Sep 20, 2020
    trucky909, Sep 20, 2020
    #20
    singlescrewshaker Thanks this.
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