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New clutch caused change in rpm to road speed ratio

Discussion in 'Ask An Owner Operator' started by Jbcjohnb92, Jan 8, 2020.

  1. Jan 8, 2020 #1
    Jbcjohnb92

    Jbcjohnb92 Bobtail Member

    2
    0
    Mar 30, 2017
    0
    Just had new clutch installed in a 2013 Cascadia with a dd15. My rpm at highway speeds has dropped around 300 rpm. I now tach 1100 rpm at 70 mph. Prior to the new clutch it was tach around 1400 - 1500
    Any explanation?
     
    Jbcjohnb92, Jan 8, 2020
    Jbcjohnb92, Jan 8, 2020
    #1
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  3. Jan 8, 2020 #2
    Mattmanstroked

    Mattmanstroked Light Load Member

    185
    279
    Nov 24, 2019
    0
    Unless the old clutch was slipping badly I don't know how this could be
     
    Mattmanstroked, Jan 8, 2020
    Mattmanstroked, Jan 8, 2020
    #2
    Twin Sticks, Bean Jr. and Rideandrepair Thank this.
  4. Jan 8, 2020 #3
    Dale thompson

    Dale thompson Road Train Member

    5,175
    43,362
    Nov 20, 2013
    commerce twp,mi
    0
    Impossible if the clutch was slipping that much the heat would cause catastrophic failure in less than 30 miles.
     
    Dale thompson, Jan 8, 2020
    Dale thompson, Jan 8, 2020
    #3
    Bean Jr. and Rideandrepair Thank this.
  5. Jan 8, 2020 #4
    062

    062 Road Train Member

    6,216
    33,468
    Oct 20, 2013
    0
    Sounds like they put a od trans in where a direct drive was.
     
    062, Jan 8, 2020
    062, Jan 8, 2020
    #4
    Bean Jr. and Rideandrepair Thank this.
  7. Jan 8, 2020 #5
    starmac

    starmac Road Train Member

    6,639
    12,528
    Apr 11, 2019
    Fairbanks Ak
    0
    Speed or tach sensor messing up. It is not possible for the clutch to change speed.
     
    starmac, Jan 8, 2020
    starmac, Jan 8, 2020
    #5
    GFTLLC, Bean Jr., Swine hauler and 2 others Thank this.
  8. Jan 8, 2020 #6
    HillbillyDeluxeTruck

    HillbillyDeluxeTruck Road Train Member

    5,933
    30,328
    Mar 3, 2013
    San Antone
    0
    Starmac is right. Id bet on it being the speed sensor in the rear of the trans. Check to makee sure its installed correctly.
     
    HillbillyDeluxeTruck, Jan 8, 2020
    HillbillyDeluxeTruck, Jan 8, 2020
    #6
    GFTLLC, Bean Jr. and Swine hauler Thank this.
  9. Jan 9, 2020 #7
    Twin Sticks

    Twin Sticks Bobtail Member

    30
    47
    Jul 23, 2019
    0
    Clutch changing road speed not possible. Ditto on a sensor
     
    Twin Sticks, Jan 9, 2020
    Twin Sticks, Jan 9, 2020
    #7
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