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Thread: gearing

  1. #1

    Default gearing

    i have 3.42 gears and was thinking about going to some 3.72s. do i have to replace the front gears also? i dont know much about gears and all so any help would be great
    07 new body silverado, 4.8L, 4x4, ex cab, Pioneer flip out dvd screen, what muffler?, 2" fabtech leveling kit
    Maxxis Buckshot Mudders 285/70

  2. #2


    Yep you need to do the front gears too. Otherwise when you run it in 4 wheel drive the front and the rear axles will want to spin at different rates. This causes all kinds of problems.
    1999 GMC Sierra 2500 350 vortec
    1967 Jeep M725 ambulance 230 tornado
    1990 Cherokee Limited- 3 inch lift on 33's
    ...and every one of em has issues

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  3. #3
    finalday7's Avatar
    Join Date
    Oct 2007
    Sayward, B.C Canada


    Yeah you have to do both. It doesn't have to be too expenisive buy labor will cost you. You can find some 3.73's on for about 140 a set but you'll have to buy probly 2 master install kits as well there about 75 bucks a piece and install will run you between 450 and 900.. So I'd say you'll be looking at around 1100 bucks. Hope this helps

    2007 GMC Sierra CrewCab 4.8L
    Tinted Windows, 20" Chrome MB Predators on 275/55/20 Copper AT's, GM Bed Rug, Speed Scene Chrome Grille, Putco Chrome Handles, Hypertech Max Energy Programmer, Magnaflow Muffler and many more mods to come.
    Former GM Vehicles:
    96 Chevy Camaro. My first car modded for a High School kid.

  4. #4


    thanks guys. this help me decide to wait for a while. id rather spend the money on other mods for horse power and off road ability. but thanks again

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