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Codes in glovebox

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by K5Buckeye, Jul 29, 2001.

  1. K5Buckeye

    K5Buckeye Registered Member

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    I want to find out what R&P I'm running in my Jimmy. The codes in the glovebox, one of those represent the gears, right? Anyone got a master manual or something to decipher the codes?
    Thanks.

    1972 K5
    1991 Jimmy
     
  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Here's the codes for gears:

    GU2- 2.73
    GU4- 3.08
    GU5- 3.23
    GU6- 3.42
    GT4 or 5X1- 3.73
    GT5 or GT8- 4.10
    G80- Limited Slip Diff

    If you need any more codes deciphered feel free to ask. I have a GM RPO book right beside the computer[​IMG]!!!!!!



    <font color=red>PHOTO ALBUM-</font color=red> <a target="_blank" href=http://albums.photopoint.com/j/AlbumList?u=1289798>http://albums.photopoint.com/j/AlbumList?u=1289798</a>.......<font color=blue>TRUCK & HIKING PICS</font color=blue>
     
  3. K5Buckeye

    K5Buckeye Registered Member

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    CanmoreK5, thanks dude!! I got GU6 and G80... sweet! I wonder if I can switch to 4.10's or 4.56's and keep the posi?

    1972 K5
    1991 Jimmy
     
  4. LAZYMON

    LAZYMON 1/2 ton status Premium Member

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    What year did they start putting the codes in the glovebox?On my 73 it is on top of the drivers side wheel well and it is very hard to read.

    Let The Sun Shine Down Upon My Face
    Topless 73
     
  5. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    My 84 had the RPO sticker in the same place, Lazymon. It started getting faded and waterstained, so before it got unreadable I pulled it off and left it in the glovebox for safekeeping. I'm not sure when GM started installing them in the glovebox- sure makes a lot more sense to me!!!



    <font color=red>PHOTO ALBUM-</font color=red> <a target="_blank" href=http://albums.photopoint.com/j/AlbumList?u=1289798>http://albums.photopoint.com/j/AlbumList?u=1289798</a>.......<font color=blue>TRUCK & HIKING PICS</font color=blue>
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Your prolly not going to be happy to hear it, but you've got a gov-lock, not posi. Beat on it hard, and your not gonna be happy ; )

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  7. txbartman

    txbartman 1/2 ton status

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    I have an 85 and the sticker is in the glove box. Guess that answers the "when" question!

    Brian
    Click to see <a target="_blank" href=http://tx85gmcguy.alloffroad.com> My 85 Jimmy </a>
     
  8. Jonathan

    Jonathan 1/2 ton status

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    My 77 has a sticker in the Glove box that lists every option ordered on it. It says G80 Locking Differential.

    77 Blazer, 350, NP203, K&N, 31-inch Cooper Discoverers
    <font color=white>http://community.webshots.com/user/jonathandwill</font color=white>
     
  9. newyorkin

    newyorkin 1 ton status

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    I just got the codes last week. I ran out to my truck all excited like a kid at christmas, and looked in the glove box... To find the PO had already ripped it out and left no forwarding address... Kinda explains why my ins/reg card holder keeps sticking to the box... Oh well. Guess I'll have to count teeth one day...

    Ratch
    <a target="_blank" href=http://k5.8m.com>k5.8m.com</a>
    **K5 - What more is there to life?**
     
  10. K5Buckeye

    K5Buckeye Registered Member

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    dyeager535, a gov-lock is not a posi? what is it? and is a gov-lock not a very strong unit?
    thanks.

    1972 K5
    1991 Jimmy
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    It's basically a hybrid posi. It is open until one wheel wpins X RPM's faster than the other. Centrifugal force, along with gears, lock the two axles together.

    Problem with a truck when you beat on it are two fold...the truck tires are generally large, and thus heavy..when one wheel is spinning fast, and the other axle is suddenly locked positively to the one spinning, the centrifugal force of the spinning tire can be enough to completely shatter the carrier.

    Now, back to the real world. Even with big tires, if you do not "beat on" your truck, it won't break probably. If you don't spin the tires (unless you slowly bring the rpms up) you won't have problems. I had one in my '83 for 4 years, and I've got one in my '86 axle...both had been in constant use since production, on stock vehicles that were not abused.


    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     

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