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Thread: Re-Tune?

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    AJAX161's Avatar

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    Re-Tune?

    I have some 4.30 gears for front and rear axles that need to be installed as well as a Fass 150 fuel system. I am on Stock fuel and have 3.42 gears. Do I need to Re-Tune my truck? I have MM3 with Ray's Tunes. I will be going with 40 in tires.


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    WE WILL STAND! IGOTACUMMINS's Avatar

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    Re: Re-Tune?

    Let's ask @Double R Diesel?


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    DRD's Avatar

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    Re: Re-Tune?

    Quote Originally Posted by AJAX161 View Post
    I have some 4.30 gears for front and rear axles that need to be installed as well as a Fass 150 fuel system. I am on Stock fuel and have 3.42 gears. Do I need to Re-Tune my truck? I have MM3 with Ray's Tunes. I will be going with 40 in tires.
    I think you will be fine with your current tunes.

    Sent from my SM-G960U using Tapatalk

    The Cummins Whisperer! John 3:16, Romans 10:9-10...Tuning for the Heart and Soul.


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    HKBIGDADDYDIESELDAN's Avatar

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    Re: Re-Tune?

    Quote Originally Posted by Double R Diesel View Post
    I think you will be fine with your current tunes.

    Sent from my SM-G960U using Tapatalk
    Once again Ray is always on time with right answers

    2012 Cummins Ram 6.7L MM3 tuner full 5" Flo Pro TBE Exhaust LWBCC 4x4 Mag Hytec Double Deep Transmission Pan , Mag Hytec Rear Diff Cover
    Airlift part # 57595 7500lbs airbags ,Nitto Ridge Grapplers 35/12.50/20 on XD 829 Big Hoss ll Satin Black Machined Dark Tint 20 x 9 with + 18 offset rims,MM3 Tuner With full Custom Tunes by Ray at DRD , Autometer A13117 Pillar Pod , Edge 98004 mount adapter , Mag Hytec front diff cover, SuperNova V4 LED Headlight Bulbs

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    AJAX161's Avatar

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    Re: Re-Tune?

    Ray. I got the 4:30 gears installed and the 40 in tires. I reset the tire size on the tuner but it seems like my mph is way off. I had 3:42 with 37’s.
    Any help is appreciated @Double R Diesel.


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  11. Top Of Page | #6
    DRD's Avatar

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    Re: Re-Tune?

    Quote Originally Posted by AJAX161 View Post
    Ray. I got the 4:30 gears installed and the 40 in tires. I reset the tire size on the tuner but it seems like my mph is way off. I had 3:42 with 37’s.
    Any help is appreciated @Double R Diesel.
    You need to continue to play around with tire sizes on the abs menu until you get it dialed in. Simply entering in the number 40 in case like yours will not work because the gearing has been changed. Enter a number and road test. Note how that number changed things. You will start to see a trend at some point and will be able to determine whether you need to enter a larger or smaller tire size number. Once you have that information determined, you'll be able to dial it in.

    Ray,
    Double R Diesel

    The Cummins Whisperer! John 3:16, Romans 10:9-10...Tuning for the Heart and Soul.


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  13. Top Of Page | #7
    AJAX161's Avatar

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    Re: Re-Tune?

    Thanks Ray I appreciate it!


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