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DT12 TRANSMISSION Grinding on downshift

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jwood1982, Nov 15, 2023.

  1. Nov 15, 2023 #1
    Jwood1982

    Jwood1982 Bobtail Member

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    Nov 15, 2023
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    Looking for some help, I'm running a 2021 freightliner cascadia with dd13 and dt12 transmission out of the blue it started grinding on down shift but not every gear just 12 to 11 10 to 9 and 8 to 7 check filter no shavings dealer did update to tcm and no fix was wondering if any one would have and idea were to look
     
    Jwood1982, Nov 15, 2023
    Jwood1982, Nov 15, 2023
    #1
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  3. Nov 20, 2023 #2
    biopure22

    biopure22 Light Load Member

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    Might need to drop and inspect unfortunately
     
    biopure22, Nov 20, 2023
    biopure22, Nov 20, 2023
    #2
  4. Nov 21, 2023 #3
    77fib77

    77fib77 Road Train Member

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    Tractor leveling valve. If tractor height is off the drive line can make noises
     
    77fib77, Nov 21, 2023
    77fib77, Nov 21, 2023
    #3
  5. Nov 24, 2023 #4
    Jwood1982

    Jwood1982 Bobtail Member

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    Nov 15, 2023
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    Yea thats what I did, but they don't seem to know right now
     
    Jwood1982, Nov 24, 2023
    Jwood1982, Nov 24, 2023
    #4
  7. Nov 24, 2023 #5
    Jwood1982

    Jwood1982 Bobtail Member

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    Nov 15, 2023
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    Interesting
     
    Jwood1982, Nov 24, 2023
    Jwood1982, Nov 24, 2023
    #5
  8. Nov 24, 2023 #6
    77fib77

    77fib77 Road Train Member

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    Is it resolved
     
    77fib77, Nov 24, 2023
    77fib77, Nov 24, 2023
    #6
  9. Nov 24, 2023 #7
    rollin coal

    rollin coal Road Train Member

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    Make sure your air bag switch isn't dumped.
     
    rollin coal, Nov 24, 2023
    rollin coal, Nov 24, 2023
    #7
  10. Nov 24, 2023 #8
    Jwood1982

    Jwood1982 Bobtail Member

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    Nov 15, 2023
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    No its not resolved air bag switch is not dump, the transmission is grinding on down shift, and only every odd gear
     
    Jwood1982, Nov 24, 2023
    Jwood1982, Nov 24, 2023
    #8
  11. Nov 24, 2023 #9
    77fib77

    77fib77 Road Train Member

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    St Louis
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    Get underneath and look for stuff. I have read where bolts get lose and the transmission gets a little crooked. Then difficulty shifting.
     
    77fib77, Nov 24, 2023
    77fib77, Nov 24, 2023
    #9
  12. Nov 25, 2023 #10
    Jwood1982

    Jwood1982 Bobtail Member

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    Nov 15, 2023
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    I guess it won't hurt
     
    Jwood1982, Nov 25, 2023
    Jwood1982, Nov 25, 2023
    #10
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