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24.5 11R to 24.5 lp tires on pete 389

Discussion in 'Peterbilt Forum' started by Black389, Oct 5, 2018.

Page 1 of 2
  1. Oct 5, 2018 #1
    Black389

    Black389 Light Load Member

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    Whats up people. Not sure if im asking this question in the right place, but here it goes.
    I have a 2015 pete 389 with 3:55 rear with 18 speed. When i bought this truck brand new it had Bridgestone 24.5 11r all the way. I just bought a new Bfgoodrich tires in 24.5 lp, and now my speedometer is off by 5-6 mph. My rpm is too high at 70mph (1500+) before i could be going 75+ with rpms around 1550. It slows down a lot on hills. Is there anything i can do or is my best bet to buy another set of 8 drive tires? One guy told me i can change the tire size in the ecm but wont that only fix my speedometer? Im just confused my friend has same truck (motor, ratio, trans) and he has 22.5 lp and hes just fine with his rpms, he can be running 80mph in NV and still have his rpms under 1700.

    Really appreciate it!
     
    Black389, Oct 5, 2018
    Black389, Oct 5, 2018
    #1
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  3. Oct 5, 2018 #2
    Rubber duck kw

    Rubber duck kw Road Train Member

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    8 new tall tires would be the easiest if you're looking to get back to moving right along at low rpms. If you just want your speedometer fixed they should be able to do that at most any shop I think.
     
    Rubber duck kw, Oct 5, 2018
    Rubber duck kw, Oct 5, 2018
    #2
    Black389 Thanks this.
  4. Oct 5, 2018 #3
    Black389

    Black389 Light Load Member

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    #### it! Have to spend another 4k on tires now. Its also drinking fuel like crazy
     
    Black389, Oct 5, 2018
    Black389, Oct 5, 2018
    #3
  5. Oct 5, 2018 #4
    Rubber duck kw

    Rubber duck kw Road Train Member

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    Just put talls back on her and find somebody to buy your lopros for 500 bucks less than you played for them, somebody will buy them. That's a nice looking truck.
     
    Rubber duck kw, Oct 5, 2018
    Rubber duck kw, Oct 5, 2018
    #4
    Black389 Thanks this.
  7. Oct 5, 2018 #5
    Cat sdp

    Cat sdp . .

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    Something is different on your buddies truck....... there’s no way 22.5s would run the same as your old 24.5s .....

    Something has to be spec’d differently.
     
    Cat sdp, Oct 5, 2018
    Cat sdp, Oct 5, 2018
    #5
    pushbroom, Oxbow and Ruthless Thank this.
  8. Oct 5, 2018 #6
    jake744

    jake744 Light Load Member

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    When I ordered my 389 I got tall 24.5's and its 3.55. If I got low 24.5's it would have been 3.36 and 22.5 low was 3.25. I would say change to 3.36 gears or go back to tall 24.5's.
     
    jake744, Oct 5, 2018
    jake744, Oct 5, 2018
    #6
    Black389 Thanks this.
  9. Oct 5, 2018 #7
    Black389

    Black389 Light Load Member

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    What do i need all in parts,What is the expense to change gears? I really wanted to stay with 24.5 lp.
     
    Black389, Oct 5, 2018
    Black389, Oct 5, 2018
    #7
  10. Oct 5, 2018 #8
    Rubber duck kw

    Rubber duck kw Road Train Member

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    Get good used parts and I don't think it would cost more than 4 grand to maybe 5 but I'm really not sure on that.
     
    Rubber duck kw, Oct 5, 2018
    Rubber duck kw, Oct 5, 2018
    #8
  11. Oct 5, 2018 #9
    I glide 47

    I glide 47 Road Train Member

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    New tires may use more fuel what's the rolling resistance
     
    I glide 47, Oct 5, 2018
    I glide 47, Oct 5, 2018
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    magoo68 Thanks this.
  12. Oct 5, 2018 #10
    Ruthless

    Ruthless Road Train Member

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    More than a set of tires. Last front chunk I got (Eaton genuine reman) was $3800 plus labor. Rear rear was going for $2350 at that time.
     
    Ruthless, Oct 5, 2018
    Ruthless, Oct 5, 2018
    #10
    SAR, Black389 and Oxbow Thank this.
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