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I'm sure this has been asked before but...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 72junker, May 24, 2000.

  1. 72junker

    72junker Registered Member

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    I\'m sure this has been asked before but...

    Saw a trashed K5 is a ghetto junkyard today while driving by. Was wondering if there's a way to tell what the ratio of the gears are in the axles by looking on the housing? Also is there an easy way to ID the axle? I know what my 10 bolts look like, assuming a 12 bolt has 2 more bolts. What about a Dana?

    Thanks,

    Troy
     
  2. chaka73

    chaka73 1/2 ton status

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    Re: I\'m sure this has been asked before but...

    Hey Junker go to the technical page and click on the differentials that'll take you to the page where you can compare them.

    LOVE MY GREEN GIANT!!!
     
  3. 72junker

    72junker Registered Member

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    Re: I\'m sure this has been asked before but...

    Thanks. Gonna stop by there is the next couple days. If I don't get mugged hoping to score some cheap parts to get the disaster rolling.

    Troy
     
  4. chaka73

    chaka73 1/2 ton status

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    Re: I\'m sure this has been asked before but...

    Well take some buddies with you, any trouble and let them have it, you're gonna need at least a couple friends to help you load up the axles anyway good luck bud, and I'll talk to you guys tomorrow, I am gone for the day later dudes.

    LOVE MY GREEN GIANT!!!
     
  5. behemoth

    behemoth 1/2 ton status

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    Re: I\'m sure this has been asked before but...

    ...take Buttman with you.
     
  6. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Re: I\'m sure this has been asked before but...

    If it's pre 81 then check the options sticker in the glovebox or sometimes it's on the driverside inner fender. White sticker with blue printing. If it's stock it will not have a ratio listed if it's the option axle it will list it on that sticker. 3.73 would be what you will find. It will also list if it has a locking diff. Sometime after 81 it went from plain text to codes.

    Diging it in the dirt with my K5's
    Grim-Reaper
     
  7. MudFrog

    MudFrog 1/2 ton status

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    Re: I\'m sure this has been asked before but...

    What if it's after '81? I'd like to know how to tell what ratio is in a mid 80's blazer.
     
  8. Blazer1970

    Blazer1970 1/2 ton status

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    Re: I\'m sure this has been asked before but...

    After '81:

    GU2 = 2.73
    GU4 = 3.08
    GU6 = 3.42
    GT4 = 3.73
    GT5 or GT8 = 4.10 (probably not found in a Blazer)

    G80 = Gov-lock rear

    Tim

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

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