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Find gear ratio on pete 389

Discussion in 'Peterbilt Forum' started by Wespipes, Aug 30, 2020.

Page 2 of 2
  1. Aug 31, 2020 #11
    Wespipes

    Wespipes Road Train Member

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    Mystery is solved! Its 3.42. Which is good news to me. Was told 3.25 when I bought the truck lol
     
    Wespipes, Aug 31, 2020
    Wespipes, Aug 31, 2020
    #11
    singlescrewshaker Thanks this.
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  3. Aug 31, 2020 #12
    JonJon78

    JonJon78 Road Train Member

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    Why is 3.42 vs 3.25 good news? Just curious...
     
    JonJon78, Aug 31, 2020
    JonJon78, Aug 31, 2020
    #12
  4. Aug 31, 2020 #13
    Wespipes

    Wespipes Road Train Member

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    Wespipes, Aug 31, 2020
    Wespipes, Aug 31, 2020
    #13
  5. Aug 31, 2020 #14
    pushbroom

    pushbroom Road Train Member

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    DSP40 diffs 3.42 ratio as you found out already.

    If the ecm was set for a different diff ratio it just makes the speedo inaccurate.
     
    pushbroom, Aug 31, 2020
    pushbroom, Aug 31, 2020
    #14
    spsauerland, singlescrewshaker and Wespipes Thank this.
  7. Sep 2, 2020 #15
    Geronimo17

    Geronimo17 Light Load Member

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    Good luck with the truck. Any photos?
     
    Geronimo17, Sep 2, 2020
    Geronimo17, Sep 2, 2020
    #15
  8. Jun 11, 2021 #16
    dirtyrabbit

    dirtyrabbit Medium Load Member

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    If you walk into the dealership, they can print off a build sheet for the truck. Every time I've gotten into a truck, I've made that request and always had them handed right over.
     
    dirtyrabbit, Jun 11, 2021
    dirtyrabbit, Jun 11, 2021
    #16
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