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What Rear Gears do I want on a 13 speed

Discussion in 'Ask An Owner Operator' started by wheelman666, Jan 30, 2018.

Page 1 of 4
  1. Jan 30, 2018 #1
    wheelman666

    wheelman666 Medium Load Member

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    May 9, 2011
    Lake Katrine NY
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    I currently have a Cummings with an EF auto 10 and 3.55 rears and i love the combo. great pickup speed, good on hills, MPG could be a little better.
    I'm looking at going to a EF auto 13 with a Cummings, what rears would give me the same out come and maybe a tad better MPG?
    I run East coast, SC to MA and out as far as IA. loads from 30K to 45K regularly.
     
    wheelman666, Jan 30, 2018
    wheelman666, Jan 30, 2018
    #1
    OLDSKOOLERnWV Thanks this.
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  3. Jan 30, 2018 #2
    KB3MMX

    KB3MMX Road Train Member

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    Orrstown, PA
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    Some guys really take offense to misspellings .... It's CUMMINS , not Cummings ... Like calling a FORD a FERDE , obviously wrong.


    CUMMINS has made a lot of motors, which one do you have?

    Generally speaking, a 3.08 is completely feasible with where you run.

    I run 2.64 rears with a overdrive 12spd trans in that lane running gross wt#


    .
     
    Last edited: Jan 30, 2018
    KB3MMX, Jan 30, 2018
    KB3MMX, Jan 30, 2018
    #2
    Crude Truckin' Thanks this.
  4. Jan 30, 2018 #3
    Crusader66

    Crusader66 Road Train Member

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    It's "a lot" not "allot", lol.

    Sorry, couldn't resist.
     
    Crusader66, Jan 30, 2018
    Crusader66, Jan 30, 2018
    #3
    Justrucking2, OLDSKOOLERnWV, ShooterK2 and 3 others Thank this.
  5. Jan 30, 2018 #4
    KB3MMX

    KB3MMX Road Train Member

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    Haha thank you!
     
    KB3MMX, Jan 30, 2018
    KB3MMX, Jan 30, 2018
    #4
    OLDSKOOLERnWV and Crusader66 Thank this.
  7. Jan 30, 2018 #5
    201

    201 Road Train Member

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    Apr 16, 2014
    high plains colorado
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    I can't give any advice with an automatic, but as an old timer, there's nothing wrong with calling a "Columbus Vibrator" a Cummings. :thumbup:
     
    201, Jan 30, 2018
    201, Jan 30, 2018
    #5
    stwik, Brickwall and Big_D409 Thank this.
  8. Jan 30, 2018 #6
    wheelman666

    wheelman666 Medium Load Member

    380
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    May 9, 2011
    Lake Katrine NY
    0
    Sorry guys - auto correct can be a pain when it corrects the wrong thing -

    I have a ISX15 Prostar (Don't laugh she runs like a demon) with the EF Ultra 10. I'm looking at an EF UltraPlus 13. so to get basically the same pull up the hills, the same pickup and go (passing power) and hopefully a little better MPG, on the 13 speed what rears? i am assuming its not the same or is it?
     
    wheelman666, Jan 30, 2018
    wheelman666, Jan 30, 2018
    #6
  9. Jan 30, 2018 #7
    Elroythekid

    Elroythekid Road Train Member

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    Halifax Nova Scotia
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    What is the final ratios of the Trans? 11r tires or low pro? Where is the torque peak for that engine. Crunch those numbers and you should have your answer.
     
    Elroythekid, Jan 30, 2018
    Elroythekid, Jan 30, 2018
    #7
  10. Jan 30, 2018 #8
    wheelman666

    wheelman666 Medium Load Member

    380
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    May 9, 2011
    Lake Katrine NY
    0
    How doe this sound to anyone?
    Pacar MX13 (currently set at 455hp) with a Ultrashift PLus 13, running 22.5 Low Pro and a 3.36 rear ?
     
    wheelman666, Jan 30, 2018
    wheelman666, Jan 30, 2018
    #8
  11. Jan 30, 2018 #9
    russtrucker

    russtrucker Road Train Member

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    Mar 27, 2012
    Central PA
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    Mx13, 13 speed, 22.5 lo pro with 3.36.
    65 mph@1375 rpm and 70 mph@1475. Sweet spot for 455 hp 1650 torque is between 900-1400 rpm which the fastest you can set your cruise on is 67 mph.
     
    russtrucker, Jan 30, 2018
    russtrucker, Jan 30, 2018
    #9
  12. Jan 30, 2018 #10
    Rugerfan

    Rugerfan Road Train Member

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    Redding,CA
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    You might even look for a lower rear end ratio if just running east coast and Midwest. I know christner runs like a 2.94 or 2.64 and they get great mileage
     
    Rugerfan, Jan 30, 2018
    Rugerfan, Jan 30, 2018
    #10
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