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TIRES & GEARS

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KILLERK5, Oct 23, 2000.

  1. KILLERK5

    KILLERK5 1/2 ton status

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    OK, IM STILL CONFUSED. WHEN I UPGRADE MY TIRES FROM 33'S TO 35'S, DO I HAVE TO GET GEARS, IS IT GOOD TO GET GEARS? WHATS THE DEAL.

    THANKS
     
  2. WakeBoard&4X4er

    WakeBoard&4X4er 1/2 ton status

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    what gears do you have???
     
  3. KILLERK5

    KILLERK5 1/2 ton status

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    I STILL HAVE THE STOCK GEARS. (WHATEVER THEY ARE)
     
  4. rich'90

    rich'90 1/2 ton status

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    If they are stock then you probably have 3.07:1
    What year is your vehicle, does it have a 700R4? If it has overdrive then you definately want different gears. I would say you want them anyway. It will really dog your engine out not to mention burn out your tranny if it has overdrive and you drive it in that. I went with 4.56:1 for my 35's. If someone tells you that you can't tell the difference don't believe them. It was a huge change in power like you would not believe. 4.11:1 are good for that size too, depends on what you want.
    Good luck.

    Go heavy or Go home[​IMG]
     
  5. Emmettology 101

    Emmettology 101 3/4 ton status

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    Take a diff cover off and either count the teeth or look on the ring gear for a ratio number it will look like this but with different numbers: 41:10

    then divide the big number by the little number and you will get your ratio. 41:10 equals 4.10 ratio!

    Or you could count the teeth on the ring and pinion and come up with the 41;10 type number. then divide.

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; http://emmett.coloradok5.com
     
  6. KING K5

    KING K5 1/2 ton status

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    Ok fellas, this is what I have.
    '81 K5, 5.7L 350, th350 tranny and 208t-case with 3.07's
    I just recently put a 6" lift on and would like to go to the biggest tire I can fit and still be pretty flexy and also lower my gears. So this is a two part question,
    #1 what is the biggest tire I can run and still have plenty of room for flex? (I'm thinking either 35-36's but you tell me)
    #2 what would be the best gear ration to go to for this setup?
    Thanks for your help in advance!

    Jeff
     
  7. Emmettology 101

    Emmettology 101 3/4 ton status

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    I run 35's on a 6" Superlift Superride lift with minor trimming. I want to go up to 36's or 38's so you will be fine there.

    As far as gears go. I would run somewhere in the 4.10-4.88 range. For more street use run 4.10's.. If it is a trail rig run the 4.88's or lower. If it lays somewhere in between there, go 4.56's..

    With 4.88's and a TH350, you will running about 3K RPM at 60MPH..

    HTH

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; http://emmett.coloradok5.com
     
  8. Executioner

    Executioner 1/2 ton status

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    Location:
    Temp. Ft. Walton Beach Fl. home=Tucson, Az.
    And if the speed limit is 70-75MPH, and you like to make time, and keep up with traffic, say 80-90MPH
    THINK ABOUT IT !
    Good Luck
     

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