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  1. #1
    Jr. Apprentice
    Join Date
    May 2009
    El Dorado Arkansas

    Default Gear change question

    hey fellas newbie here. i have an 05 silvy 4 wheel drive with the 5.3 high output engine...and ive got a k and n CAI and aftermarket flowmaster and even have the hp tuners program and ever since i got the truck its always been pretty quick but will not break the tires loose for nothin. i recently found out that it has the dankest gear ratio possible for a truck ....3.42's. a buddy of mine has about the same truck with 4.10 gears in it and a stock everything and can burn rubber on demand. i was just basically wanting to throw this out there to any of you guys and see if it is that really high ratio that is killing my low-end get up and go. i got stuck pretty bad a while back in some deep quick sand type mud haha and in 4 high the truck just boggs down and does not want to turn the wheels. in fact i threw it in reverse and floored it and it barely moved the tires. I do have a winch and a bumper on the front of it and some 32 inch bf muds but it just dont have any balls down low. im thinking about going to a 4.10 or a 4.56 gear set and (i am aware that i will have to replace the front and back gears and i am VERY aware of the price of doing so haha) i just want to be able to pull out of somewhere and leave some rubbery trails on the asphalt. the engine runs great and the tranny is solid so i guess my main questions are 1) is the 3.42 gear ratio the culprit here? 2) would going to 4.10s or 4.56's help get some low end balls and torque and 3) would 4.10s or 4.56s be better for the most torque and acceleration? i do understand that going to a lower gear will raise highway rpms and possibly hurt milage etc......any advice would be greatly appreciated

    thanks bryan

  2. #2


    You will get lots of opinions on which gears to use. If you want to burn rubber why not trying some smaller tires? LOL Just kidding.
    I will tell you this. Once you are stuck in the mud your differential ratio becomes a moot point.

    if I had your truck I would keep the 3.42 axles as they work great on the pavement and go for some locking differentials. If you are really serious about low end power why not get a lower geared transfer case?

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3


    welcome to the site

    2003 Z71 Silverado LS
    Access roll up cover
    Bed Rails
    Billet Grill insert
    Bed Rug
    CB with PA system
    Waiting to be installed
    Two 8in RF HX2 punch( would have 12s but they got stolen)

  4. #4


    Welcome. See my post in the Tech section on the thread you posted there.
    2005 Chevy Silverado Z71 in Black

    6" BDS Suspension Lift | 3" BDS Body Lift |17" Rock Crawler Stellies | 35" Cooper STTs | 4.56 Yukon Gears | AirAid CAI and TBS | Flowmaster 40s | HyperPAC Programmer

    2001 TJ Sahara in Sienna

    3.5" RE Suspension Lift | 33x12.50 Baja MTZs | D30/44 | ROKMEN Merc Front Bumper | Warn Rockcrawler Rear w/ Carrier | Warn M8000 Winch

  5. #5
    Legend bry2500's Avatar
    Join Date
    Oct 2008
    Gloucester, MA
    Blog Entries


    i agree on the locker. No need to swap out everything and you can still get good mileage.


    02' Avalanche 2500 Onyx Black
    8.1L Vortec
    43,000 miles

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