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  1. #1

    Angry Re-gearing a 2013 Silverado 1500 LT

    Hi, I am currently in the process of lifting my 2013 Silverado 1500 LT 5.3 with a Cognito 10-12 Inch lift kit. Set at 12 inch. Balljoint Upper Control Arms, Front cognito Swaybar, Fox/Cognito Coilovers, 8" Deaver Leaf Springs, 3.5" Fabricated Block & Ubolt Kit. 44" Economy Traction Bars, Front CV Driveline. 37x13.50x20 Toyo Open Country M/T Tires on 20x10 BMF Wheels. Stock gears are 3.42, What size gears should I run. I will not be towing anything, mostly just driving around town and some freeway miles. I dont want to loose to much power but I also dont want to run down the freeway at 65 mph tached out. Can somebody please help

  2. #2


    I would suggest at least a google, there are a few calculators that will help out. I ran 38.5" with a 4:56 and turned about 1,100 rpm at 70mph

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. #3


    Welcome to the club, it's good to have you with us.

    2002 Chevrolet Silverado Extended Cab SportSide: See Mods in My Garage

  4. #4


    to the GMTC

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
    Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.

    Check out my other mods in My Garage:

  5. #5


    Welcome to GMTC, hope people here can help you with your lifting
    1994 GMC Yukon, 2 door, Victory Red
    Garage Link:

  6. #6


    That's a hell of a lot of lift for a 1500. Might wanna upgrade ur brakes while your at it
    2009 chevy 1500 z71 4x4
    2.5 ccm level,2.5 inch rear blocks 305/60/18 coopers stt,Debadged,10 series flow w/dual exit in front or right rear tire, KN CAI, diablo InTune, 18% tint all the way around ,spec-d euro headlights with black housings,winjet smoke LED tail lights,putco LED third brake light smoked, fab fours front bumper with 10k warn winch, RK sports ram air hood
    1965 c10 swb, zz4 350 with the hot cam and fast burn heads and a 780 Holley on top, richmond super street 5 speed,restorod

  7. #7


    Thanks everybody for the welcome and suggestions. As far as brakes go I would like to upgrade, I'll check into it. hopefully not to many $$$$$$$$$$$

  8. #8


    Welcome to GMTC!!

    I would agree with Pikey, anything higher than 4.56 and you'll be howling on the freeway!! I would suggest 4.88 as well, I ran those with 6" lift and 35's and it ran like factory.
    2004 Chevy Colorado 2wd/4l60e/3.5 Inline 5
    6-PIAA 520 series yellow ion spot lights 85 watts each
    PIAA quattro fog lights w/extreme white/yellow ion bulbs
    Anzo projector headlights/LED turn signals
    LED underbodys 7-color/LED interior lighting
    JET stage 2 performance chip/Magnaflow exhaust S/S
    Recon Big Rig Lights/LED tail lights/3rd brake light
    Putco LED bed lights/BEDRUG
    Goodmark 2" rise Cowl hood/K&N fipk intake
    98-04' Blazer overhead console & floor console
    40/60/40 seat modified to 40/console/40
    33" Cooper Discovery A/T
    16" Pro Comp extreme alloy wheels

  9. #9


    Yeah I'm thinking 4.88 gears to.

  10. #10



    I run 4.56's on my 34" tires and it has me close to stock gearing (I used to have 3.73) with stock tires ... with a mild bias toward power. For 37's you'll want shorter gears than I have ... and 4.88's are what make sense. Your highway fuel milage is going to be atrocious -- plan for that.

    As others have noted you will also want to upgrade your brakes, as your 37" tires will turn less across a given distance than your OEM tires, resulting in less opportunity for your brakes to do their work. Add to that the sheer weight and momentum of those 37's and you will want a big brake kit on all corners ... with at least 4 piston calipers. You'll probably also want cryo-treated rotors since stopping those beastly tires will put out some heat ... and so your rotors need to resist it as well as possible, to avoid warping.

    Also don't forget that this will mean longer brake lines -- which will reduce pedal feel. I strongly recommend stainless steel lines to help restore pedal feel.

    I'd be very wary of the temptation to off-road your truck once the mods are done, as your chief weak points are still the the rear diff and axle used for the 1500 ... and the wheels/tires for 37's are some serious weight to turn/move.

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