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  1. #1

    Default Biggest tire without gearing

    Hey I have my stock 2006 z71 on 9 inches of lift on 38x15.50x 20 I'm about to gear it but wondering if I go with a smaller tire what should I get so I don't have to gear it. THANK YOU

  2. #2

    Default

    As I understand it, the goal in selecting a final drive ratio/tire size is to pick the ratio/tire combination that will allow the engine to run at ~2000 rpm in OD at ~60 mph. What gear ratio is currently installed? Which tranny (and what is it's OD ratio, if you know)? What engine speed are you currently running at 60 in OD (if automatic, is it shifting into 4th gear)?
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
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    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  3. #3

    Default

    i wanna see some pics of that!!
    PETE
    95 GMC Sierra 2500
    3" Body Lift, 33" Goodyear MTR's
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    Sold :(
    1999 Jeep Cherokee, 3" Rustys lift, 33" BFG MT's, locked, armored: Rolled :(
    2000 Jeep Grand Cherokee Limited. K&N Intake, Custom Kolak Exhaust


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  4. #4
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    finalday7's Avatar
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    Default

    Unless your running a minimum of 4.56 then I'd recommend that you regear. With 9"'s of lft I wouldn't go smaller then 37's. If you keep your current tires I'd probly go with some 4.88's. By the sounds of it your still running stock gears, probly 3.73. Trust me, your going to want to regear or you'll be sorry later.

    KRIS
    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.

  5. #5

    Default

    your running stock gears on 38's??? I thought the rule of thumb was don't go over 35's on stock gears. 35's would look weird though with 9 inches of lift. What gears do you have now?
    Dan
    1999 GMC Sierra 2500 350 vortec
    1967 Jeep M725 ambulance 230 tornado
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  6. #6

    Default ratio calculator

    go to www.bncoffroad.com the have a calculator on the site

  7. #7

    Default

    Ya I am running stock gears now but it is just temporary I'm about to install my 4.88's and I guess will keep the 38" tires I will put pictures up soon thanks

  8. #8
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    finalday7's Avatar
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    Default

    No problem and can't wait for the pictures.

    KRIS
    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.

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