How do you use the jake brake on a truck with an automatic transmission?

Discussion in 'Experienced Truckers' Advice' started by expedite_it, Oct 22, 2020.

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  1. tarmadilo

    tarmadilo Road Train Member

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    Whew, I thought maybe expedite_it was back!
     
    tarmadilo, Jun 26, 2025
    #71
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  2. Crude Truckin'

    Crude Truckin' Alien Spacecraft

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    2200 will never hurt a healthy engine.
     
    Crude Truckin', Jun 26, 2025
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  3. Tb0n3

    Tb0n3 Road Train Member

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    Sounds like weak valve springs.
     
    Tb0n3, Jun 26, 2025
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  4. Star Rider

    Star Rider Road Train Member

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    Maybe he went back to being a trainer after all the wisdom he gained here. :biggrin_25523:
     
    Star Rider, Jun 26, 2025
    #74
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  5. Moosetek13

    Moosetek13 Road Train Member

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    I guess I'll let the 20,000 RPM stuff slide, and the head cylinder and the jet brakes as being from someone that simply has no clue.

    But claiming that 2,200 RPM going downhill with the engine brake will damage a DD-15 (presumably with the DT-12 transmission?)?
    It won't if the computer is controlling the RPM and shift points.
    Those engines were designed just for that.
     
    Moosetek13, Jun 27, 2025
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  6. 4wayflashers

    4wayflashers Road Train Member

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    Youve been driving a truck with an automated transmission for one year.

    It’s not an automatic transmission.

    You use the jake exactly the same as you would on any other truck.
     
    4wayflashers, Jul 7, 2025
    #76
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  7. D.Tibbitt

    D.Tibbitt Road Train Member

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    The turbo on that thing must be massive :D
     
    D.Tibbitt, Jul 7, 2025
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  8. Concorde

    Concorde Road Train Member

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    I want one of these for the Jetta :)

     
    Concorde, Jul 7, 2025
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  9. MACK E-6

    MACK E-6 Moderator Staff Member

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    It’s not? You mean it doesn’t shift by itself? o_O

    Do tell.
     
    MACK E-6, Jul 7, 2025
    #79
  10. 201773

    201773 Medium Load Member

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    My Allison is an automatic. Torque converter and all that.
     
    201773, Jul 8, 2025
    #80
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