Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Code question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by FunBlazer, Aug 6, 2002.

  1. FunBlazer

    FunBlazer Registered Member

    Joined:
    Jul 30, 2002
    Posts:
    29
    Likes Received:
    0
    Location:
    Lake George, NY
    Can someone tell me what gears the GU4 stood for?? My Blazer seems a little sluggish with 32's on it. Thanks
     
  2. pfloydmaster

    pfloydmaster 1/2 ton status

    Joined:
    Mar 30, 2002
    Posts:
    156
    Likes Received:
    0
    Location:
    Grottoes, Virginia
    3.08 ratio according to the code
     
  3. jc71355

    jc71355 1/2 ton status

    Joined:
    Jan 13, 2002
    Posts:
    830
    Likes Received:
    0
    Location:
    Port Neches, Texas
    How 'bout GU6?
     
  4. codeman

    codeman Registered Member

    Joined:
    May 8, 2002
    Posts:
    42
    Likes Received:
    0
    Location:
    Lincoln, Nebraska
    3.42's
     
  5. jc71355

    jc71355 1/2 ton status

    Joined:
    Jan 13, 2002
    Posts:
    830
    Likes Received:
    0
    Location:
    Port Neches, Texas
    Thanks, do you have book that tells you?
     
  6. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    RPO codes are listed in section 1 of all the GM Service Manuals that I've ever seen. Here's the list for GM light truck axles:

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

    /forums/images/icons/cool.gif
     
  7. FunBlazer

    FunBlazer Registered Member

    Joined:
    Jul 30, 2002
    Posts:
    29
    Likes Received:
    0
    Location:
    Lake George, NY
    G80= Gov-Loc. Whats that?? I have that code right next to the GU4 code. Where can I go to find out what all those codes in the glove box means??
     
  8. jc71355

    jc71355 1/2 ton status

    Joined:
    Jan 13, 2002
    Posts:
    830
    Likes Received:
    0
    Location:
    Port Neches, Texas
    Thanks Harry. Hey that's my grandfather's name, you don't see many people named that.

    Gov-Loc is chevy's sorry excuse for a locker. If taken care of I believe they will last a long life, but the one in my dad's Z71 don't even work anymore /forums/images/icons/smirk.gif .
     
  9. Suffergauge

    Suffergauge 1/2 ton status

    Joined:
    Aug 1, 2002
    Posts:
    153
    Likes Received:
    0
    Location:
    Olympia, Wa.
    Where is this code located? I will be picking up my blazer this week, can't wait, and I am hungry for info.
     
  10. jc71355

    jc71355 1/2 ton status

    Joined:
    Jan 13, 2002
    Posts:
    830
    Likes Received:
    0
    Location:
    Port Neches, Texas
    Mine's on the inside of the glovebox door. Should be the same on most. My 71 truck is the same and it even has the price. Wish you could still get a brand new loaded truck for 3,700 /forums/images/icons/grin.gif .
     
  11. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    That was my great-grandfathers name. Then my dad, then me. Hence the "3". /forums/images/icons/wink.gif But the buck stopped here. I picked another name for my son. /forums/images/icons/cool.gif
     
  12. pfloydmaster

    pfloydmaster 1/2 ton status

    Joined:
    Mar 30, 2002
    Posts:
    156
    Likes Received:
    0
    Location:
    Grottoes, Virginia
  13. Blazer_Boy

    Blazer_Boy 1/2 ton status

    Joined:
    Dec 16, 2000
    Posts:
    1,669
    Likes Received:
    0
    Location:
    Sioux City, IA, USA
    You should have been like George Foreman and give all your kids your name. Harry IV, Harry V, Harry VI....... /forums/images/icons/smirk.gif
     
  14. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    I am in the same boat, 32 inch sport kings, 83 blazer and same gearing. You can do several things to get rid of the sluggishness. One, save for a bigger motor (not neccessary with proper gearing). Two, save for lower gears ( as expensive after labor than just finding eight lug axles with proper gears). Three, just do not use overdrive below 65 miles per hour. I'm doing the latter until my wife lets me use our tax return for one ton axles.

    EDIT

    [ QUOTE ]
    I'm doing the latter until my wife lets me use our tax return for one ton axles.

    [/ QUOTE ]

    Its now 2004 , and I am not going to 1 ton axles. I want to stay 6 lug as longa s I can , like therobzilla and others
    /forums/images/graemlins/thumb.gif
     

Share This Page