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Diff Gear Codes

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Frame-upk5, Jan 23, 2002.

  1. Frame-upk5

    Frame-upk5 Registered Member

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    I was just wondering how to find out what gears are in my blazer right now. I have no idea. Im wondering if there are codes in the vin or on the door jams or on the diff or something like that.
    Thanks in Advance.
    Joe
     
  2. TXsizeK5

    TXsizeK5 1/2 ton status

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    Sticker on the inside the glove box.

    87 Custom Deluxe
    305/Sm465/ NP208
    4.56 , 35" BFG Muds, Series 40 delta flow 3" tips
    Coming Soon: Suspension Work, Eaton Posi, More Exhuast work.
     
  3. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Here they are:

    GU4 - 3.08
    GU6 - 3.42
    GT4(or 5X1) - 3.73
    GT5/GT8 - 4.10

    Hope that helps........FYI, the RPO sheet may also be located on the driver's side fender well under the hood.



    <font color=red>DIGGING AND DIGGING AND DIGGING</font color=red>
     
  4. Frame-upk5

    Frame-upk5 Registered Member

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    Off the topic but i noticed that you have the sm465 and the n208 transfer case. How did you mate those up? Just wondering what i can do to get a lower gear ratio in my xfer case.
    Thanks
    Joe
     
  5. UseYourBlinker

    UseYourBlinker 1 ton status

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    My sticker was located on the driver door frame..



    Eric
    from Freekmont,CA.

    <a target="_blank" href=http://www.community.webshots.com/user/vwryda>The darker side of nonsense...</a>
     
  6. 95 Silverado

    95 Silverado 1/2 ton status

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    the sm 465 and np208 were stock in the mid eighties blazers and trucks, I just happen to have a sm 465 with the adapter for sale, if you have a turbo 400 the transfer input is the same 32 spline, if it's a 700R4 or turbo 350 it's 27 spline, you need a 208 with the 32 spline input gear. E-mail if interested
    Wdb172454@cs.com
    photo<font color=red>

    '95 Chevy Silverado 1500
    5.7 V8-NV4500- 3.73 rears
    See My Toys: <a target="_blank" href=http://community.webshots.com/user/wdb172454>http://community.webshots.com/user/wdb172454</a>
     
  7. BillyBob

    BillyBob 1/2 ton status

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    Uh, I got some kinda weird code for my rear diff gearing.. "1GQ1".. I have no idea what that means, but it's the gearing listed on the parts ID sticker

    <a target="_blank" href=http://billybob87k5.50megs.com>Homepage of Porky & Stinky</a>
    ".. Sanatarium.. leave me be..."
     
  8. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    My RPO book says this:

    GQ1 - Axle, STD ratio

    A lot of guys have this code and I'm not sure what it means. GM probably had a set gear ratio in mind when they made the K5. I would *assume* that based on the design and anticipated use of the Blazer, 3.42s or 3.73s would fit into that category.

    FWIW, my 84 came from the factory with 3.73s. I have the trailer package, so maybe that was a factor when they installed those gears........

    A buddy runs the parts dept. for the local GM dealer. I'll try to remember to ask to him tomorrow so we can clear this up once and for all.



    <font color=red>DIGGING AND DIGGING AND DIGGING</font color=red>
     
  9. BillyBob

    BillyBob 1/2 ton status

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    Any word from your buddy? I really don't wanna pop the cover to find out my gears unless absolutely neccessary

    <a target="_blank" href=http://billybob87k5.50megs.com>Homepage of Porky & Stinky</a>
    ".. Sanatarium.. leave me be..."
     
  10. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    SHOOT!!! I forgot........It snowed 8" here today AND I had to repair a hit 1 1/2" gasline. Then my wife left the lights on on the 84 so I had to go boost her.

    There's my excuses[​IMG]!!!! Drop me a PM tomorrow in case I forget again. I'm going ice-fishing at 6:30am and the cold(-18' Farenheit) might numb my brain[​IMG].



    <font color=red>DIGGING AND DIGGING AND DIGGING</font color=red>
     

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