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Thread: Gears For 37 Inch Tires?

  1. Top Of Page | #11
    T1H5TA3's Avatar

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    Re: Gears For 37 Inch Tires?



    Depends on usage and expectations.

    37's with 4.56 almost duplicates the stock 30" tire with 3.73; at least mechanically, it doesn't compensate for the additional rotating mass, rolling resistance, etc.

    The above chart is for a 68RFE.

    Personal experience?

    I ran my current 37s with 4.88, ran terrific when towing, got great mileage, etc. (essentially equal to stock tires on 4.10s).

    As an experiment, I dropped back to my prior 4.11s ( same as stock w/3.42); for daily driving - empty, I like the drivability better, 1st is useful, shift points are where i would expect, and it grabs 6th right as im hitting 55.

    Still, fuel economy is down by about 4mpg.

    It gets better hwy mpg in 5th, LOL.

    Keep in mind, im in the PNW, so we rarely exceed 65-70; users in TX/FL, etc., who do 90 everywhere will have a different experience.





    08 r2500 quad cab 4x4 - Ugly Betty
    Deleted, AFE , 5" strait pipe , DRD Tuned
    68RFE, bonded, pressure kit , Drum, Chanel plate, ultra tight tripple
    Carli 2.5" King Shocks, Full Deaver rear
    F/R 4340 shafts, locked up, Freespin, 4.10's
    17" Icon Rebound Pros w/ 37" Baja Pro's
    IronCross bumpers F/R, 12k winch, BedSlide, Canopy , etc.

  2. Top Of Page | #12
    Watch Dog! Corkey's Avatar

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    Re: Gears For 37 Inch Tires?

    Thank you for the feedback.

    I reside in Oregon; I'm one to exceed more than the suggested speed zones LOL, especially on I-5 or I-84.

    II 60HP STICKS, II 33% CP3, II S464 2ND GEN SWAP, FASS 165 TITANIUM SIGNATURE SERIES, AFE INTAKE HORN, S&B FILTER, 5" TURBO BACK, ALPHAREX HEAD LIGHTS, 38X13.5X20 RAZOR M/T, MOTO METAL RIMS, 6" LA LIFT KIT, COMPLET MM3 KIT, BUILT TRANSMISSION, 6 BOLT REDHEAD STEERING BOX

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  4. Top Of Page | #13
    Crshanta's Avatar

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    Re: Gears For 37 Inch Tires?

    Another factor to consider is that not all tires run true to size.

    For example, BFG lists their K02 sub 37, and I measured on an AEV wheel under 36”.

    2018 srw 3500

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