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Scraping/Grinding sound after 4th gear?

Discussion in 'Questions From New Drivers' started by Lightning01, May 15, 2020.

Page 1 of 2
  1. May 15, 2020 #1
    Lightning01

    Lightning01 Bobtail Member

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    Mar 7, 2020
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    I drive a 1999 Mack E7-457 8 speed manual (Eaton fuller). So pretty much, it’s an 8 speed, so in order to go to 5th gear, I would have to flick the range selector up before changing gears. Now, this sound only happens, of course, when driving. And it is the only gear that makes this noise. And also, only when up shifting it will make this noise. I’m guessing it could be a faulty range selector. There’s times where I’ll take out the gear from 4th and the “clicking” set sound of the range selector will delay.
    So for an easier understanding, it happens like this
    1. 1st gear 2nd 3rd
    2.4th
    3. Range selector up
    4. Take out gear
    5. Scraping/Grinding sound
    6. Range selector makes the “set clicking” sound
    7. 5th gear

    I’m a total noob at this so any info will be appreciated, thank you
     
    Lightning01, May 15, 2020
    Lightning01, May 15, 2020
    #1
    truckdriver31 Thanks this.
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  3. May 15, 2020 #2
    truckdriver31

    truckdriver31 Road Train Member

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    maybe a trans job
     
    truckdriver31, May 15, 2020
    truckdriver31, May 15, 2020
    #2
  4. May 15, 2020 #3
    Powder Joints

    Powder Joints Subjective Prognosticator

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    sounds like a 2 speed rear end more than a tranny.
     
    Powder Joints, May 15, 2020
    Powder Joints, May 15, 2020
    #3
  5. May 15, 2020 #4
    trucker2121

    trucker2121 Light Load Member

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    Sounds like it giving u a breakdown hint. i'd act on it before it cost you more money on the side of the road. 1999 is a 21 year old truck keep that in mnd. Might need an upgrade before you start pour alot of money in repairs fix. then a new problem a few weeks later. might need an upgrade while used truck prices are fallen.
     
    trucker2121, May 15, 2020
    trucker2121, May 15, 2020
    #4
  7. May 15, 2020 #5
    bavarian

    bavarian Heavy Load Member

    727
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    Feb 13, 2014
    Winnipeg
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    That sounds quite normal to me. My 13 speed does the same. Just don't pre-select as long as you in 4th.

    My old tranny did it and the rebuilt one now as well. No difference.
     
    bavarian, May 15, 2020
    bavarian, May 15, 2020
    #5
  8. May 15, 2020 #6
    SmallPackage

    SmallPackage Road Train Member

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    Marion Texas
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    Try selecting the range after you go into neutral and see what it does. This may not be the “correct” way to shift that trans but it will help you troubleshoot whats wrong with it. See if it is quieter/smoother or not or if it even works at all that way but it will help figure out the problem.
     
    SmallPackage, May 15, 2020
    SmallPackage, May 15, 2020
    #6
  9. May 15, 2020 #7
    AModelCat

    AModelCat Road Train Member

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    Sounds like a range synchro on its way out.
     
    AModelCat, May 15, 2020
    AModelCat, May 15, 2020
    #7
    lester, Lightning01 and jamespmack Thank this.
  10. May 15, 2020 #8
    jamespmack

    jamespmack Road Train Member

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    Skipped over most all the bull sheet.

    @amodel is correct. Hi/lo synchro.
     
    jamespmack, May 15, 2020
    jamespmack, May 15, 2020
    #8
    Lightning01 and blairandgretchen Thank this.
  11. May 18, 2020 #9
    Lightning01

    Lightning01 Bobtail Member

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    Again I’m a noob, would I have to replace the transmission or is that something apart?
     
    Lightning01, May 18, 2020
    Lightning01, May 18, 2020
    #9
    jamespmack Thanks this.
  12. May 18, 2020 #10
    Lightning01

    Lightning01 Bobtail Member

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    ^^^^
     
    Lightning01, May 18, 2020
    Lightning01, May 18, 2020
    #10
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