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How do I know what gears I have

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dawson444, Sep 6, 2000.

  1. dawson444

    dawson444 1/2 ton status

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    Hey guys I am sometime going to add 33s w/ 4" ORD Shackle Flip and new springs in the front, and I want to know what gears I have. How do I find out what I have? (easiest way besides look at piece of paper that came w/ rig). It is a complete stock 88, w/ 10 bolts, the rear end has been rebuilt w/ that if it has anything to do with it or would change any thing. What would be good to run 33s with?
    Thanks!

    Dawson
    88 K5
     
  2. UseYourBlinker

    UseYourBlinker 1 ton status

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    I run as of today, 2.5 lift w/33's stock gears (3.08) and I have no problem's.I can reach 85 on the freeway,and can tow a horse trailer! In the future I want to get 3.73 or 4.11 (when I have $$$) I hope that kinda helps!
     
  3. BlazerGuy

    BlazerGuy 3/4 ton status

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  4. Blazer1970

    Blazer1970 1/2 ton status

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    Look at the RPO codes printed inside your glove box:

    GU2 = 2.73
    GU4 = 3.08
    GU6 = 3.42
    GT4 = 3.73
    GT5 or GT8 = 4.10
    G80 = Gov-lock locker

    Tim

    1970 Blazer CST 4X4 350 SM465 NP205
    1987 Suburban 4X4 350
    1988 Chevy Pickup 4X4 350
     
  5. GMC4by4

    GMC4by4 Registered Member

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    There will be a number stamped in the top of your axle housing- it's in different places on different years and you may have to use a wire brush to be able to read it- take that # and call the local salvage yard. They'll be able to give you all the info on your gearing and posi or whatever you have.

    -Rick
     
  6. Emmettology 101

    Emmettology 101 3/4 ton status

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    One more way is to pull your covers and there will be a ratio stamped on your Ring gear. It will look like -> 41:10 which equals 4.10's... You divide the smaller number into the larger number. Your's will be a different ratio since you will probably have 3.08's or 2.73's.....

    You will be fine with 33's with 3.08's... I ran 35's with them for about 4 years and it wasn't too bad.

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

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