C15 625 vs Series 60 500...

Discussion in 'Peterbilt Forum' started by Dave1837, Jan 15, 2020.

  1. Dave1837

    Dave1837 Medium Load Member

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    Nov 16, 2019
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    My C15 in my 379 needed serviced so I took a 386 mid-roof with a 500 S60 Detroit with an 18 speed. What a difference lol in most cases I never have to run my C15 over 1,600 rpms grossing 80k through PA hills. This Detroit will die if I run it under that and I'm only grossing 74k. Not to mention it takes forever to drop rpms to get it in the next gear. Now I know why guys shift with the jake lol. I've never used my 4 ways as much as I have on this trip. I can't wait to have my kitty cat back
     
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  3. Chubby Fly

    Chubby Fly Medium Load Member

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    Nov 25, 2019
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    If you need quick shifts coming from a stop going up hill,
    Use the fan override switch instead
     
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  4. Dave1837

    Dave1837 Medium Load Member

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    Nov 16, 2019
    Pennsylvania
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    That's a great idea I never thought of that
     
  5. Chubby Fly

    Chubby Fly Medium Load Member

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    Nov 25, 2019
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    Yeah it’s awesome. Brings those rpms pretty quick
     
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  6. Deere hunter

    Deere hunter Heavy Load Member

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    If you need it really really quick just use the fan and the Jake break !
     
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