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Smart Shift Automatic noise

Discussion in 'Ask An Owner Operator' started by dztruck, Mar 13, 2022.

  1. Mar 13, 2022 #1
    dztruck

    dztruck Light Load Member

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    Feb 22, 2017
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    So i have a 2008 cascadia i just bought used, the truck runs ok, except on 10th gear, when i accelerate, it sounds normal, but when i let off the gas pedal, it makes a weird noise, not really a grinding noise, but an unpleasant engine brake noise.

    ironically, if im at 60-65mph and the use the engine brake, the sound sort of goes away.

    anyone know whats going on or had the same issue? Ive never owned an automatic so i don’t know whats normal for them.

    its a 2008 cascadia with an automatic smart shift 10 spd.
     
    dztruck, Mar 13, 2022
    dztruck, Mar 13, 2022
    #1
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  3. Mar 13, 2022 #2
    Judge

    Judge Road Train Member

    13,300
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    Mar 19, 2014
    Arkansas
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    Have you changed the transmission oil?
    There is a filter in there too.
    May not be anything, but reading you just bought it, who knows when it was last serviced.
    I’d say change that and read end oil, using synthetic.
    It’ll be about $600-900 as that transmission oil isn’t cheap.
     
    Judge, Mar 13, 2022
    Judge, Mar 13, 2022
    #2
    Bean Jr. and dztruck Thank this.
  4. Mar 13, 2022 #3
    dztruck

    dztruck Light Load Member

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    Didnt change the transmission oil yet. What else would cause that noise. Its fine only until 10th gear and i let off the pedal it makes that sound.
     
    dztruck, Mar 13, 2022
    dztruck, Mar 13, 2022
    #3
  5. Mar 13, 2022 #4
    baha

    baha Road Train Member

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    Ck the ride height valve on the drive axle if it's set to HI or to low it can make a noise like you are hearing, ck the arm for play where it goes on the side of valve, but measure the ride height 1st when you pull off the road then ck when you are parked to the number you got when you pulled off the road, sometimes A bad valve will change ride height when you are driving?
     
    baha, Mar 13, 2022
    baha, Mar 13, 2022
    #4
    dztruck Thanks this.
  7. Mar 13, 2022 #5
    dztruck

    dztruck Light Load Member

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    Feb 22, 2017
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    If its the ride height, how is it not happening at 8 or 9th gear but only 10th. Its generally around 60-65mph
     
    dztruck, Mar 13, 2022
    dztruck, Mar 13, 2022
    #5
  8. Mar 15, 2022 #6
    baha

    baha Road Train Member

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    If the ride height valve is going bad it can build up ride height on the road and that's why when you pull off into a rest stop right off the big road and measure the ride height and compare it to the ride height that it's at parked?
     
    baha, Mar 15, 2022
    baha, Mar 15, 2022
    #6
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