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Gear Ratio Identification!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KapeKodK5, Nov 23, 2000.

  1. KapeKodK5

    KapeKodK5 Registered Member

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    I have a 1990 k5 with stock corporate axles. The sticker inside the glove box is like chinese to me. It is just a bunch of letters and numbers. Not like my old truck that had everything spelled out. I can not find any tags on the axle and I do not have the original tires (to do the rotate and mark and count the revolutions thing) If any one knows how I can decifer these letters to get my ratio it would be much appreciated.......
     
  2. BlazerGuy

    BlazerGuy 3/4 ton status

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    You could just pull the cover and count the number of teeth and use the Ring gear teeth/pinion gear teeth=gear ratio formula

    [​IMG]FUN WITH 31's![​IMG]
     
  3. JimmyDie6.2

    JimmyDie6.2 1/2 ton status

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    Print the chinese codes in this post. I will break them all for you, or you can pull the cover and count. But you'll spend some dough and get a little greasy......I have hollanders for all 60s through 90s cars and trucks.....js
     
  4. Derf00

    Derf00 1/2 ton status

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    Kapkod,

    Here are the codes:
    GU2 = 2.73
    GU4 = 3.08
    GU6 = 3.42
    GT4 = 3.73
    GT5 or GT8 = 4.10
    G80 = Gov-lock

    These are the codes that correspond to your glove box codes.

    Also if you want to know anything about your K5 you can give the last 8 digits of your Vin# to your Chevy dealer and they can tell you all the specs on you K5.
     
  5. OFFRDK5

    OFFRDK5 1/2 ton status Premium Member

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    While this topic is up top...is there a resource on the Net that we can get those codes?

    SK-15
    J**P...it's whats for dinner!
    http://SK-15.coloradok5.com
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Dude I think the resource for those codes is CK5![​IMG] I think the only list that gets posted more often is the one for number of post versus title under name.[​IMG]
    Actually I think I have the glove box codes memorized now!![​IMG]

    Rene

    [​IMG]
     
  7. OFFRDK5

    OFFRDK5 1/2 ton status Premium Member

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    Ah...so they kept the same codes? Thats why I wanted to see if there was a list of em!! Now I can find out...yea!!

    [EDIT]
    Yea..I went out to my Tank and found that its only has G80 in the glove box...now what is the ratio? Or have I missed something here? Mines an 83 and all the codes are in sets of FOUR.....not three?!?!?
    [EDIT END]
    SK-15
    J**P...it's whats for dinner!
    http://SK-15.coloradok5.com
     
  8. walt88

    walt88 1/2 ton status

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    I just checked out my 88 Blazer and I have 3.73's! I had no idea, thats awsome. Just to be sure, the numbers not in the VIN, its in the glove compartment with all the codes correct?

    Keep the shiny side up, and the greasy side down.
     
  9. Derf00

    Derf00 1/2 ton status

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    Walt,

    With reference to what I said about the vin. All Chevrolet vehicles '90 and new can have the the last several digits of vin #'s entered into GM dealers computers and it will tell you about gear ratio's, etc. This is according to my local Chevrolet dealer.
     
  10. walt88

    walt88 1/2 ton status

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    but what i am asking is I seen the code GT4 in the glove box, meaning 3.73, did I look in the correct spot.

    Keep the shiny side up, and the greasy side down.
     
  11. Derf00

    Derf00 1/2 ton status

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    Walt,

    You got it right!!!!
     
  12. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Just as a side note, you can still get a rough idea of the gear ratio by turning the tires and counting the number of revolutions the driveshaft makes...no matter what size tires you have on it. One revolution of a tire is still one revolution, no matter if its a stock 28" tire or a 44" Swamper.
     
  13. OFFRDK5

    OFFRDK5 1/2 ton status Premium Member

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    I hate to sound crazy...but does a G80=Gov-lock have a gear ratio? I don't see it listed here?!?! Thanks


    SK-15
    J**P...it's whats for dinner!
    http://SK-15.coloradok5.com
     
  14. 90K5

    90K5 1/2 ton status

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    It should have G80 and another code with it that would be the ratio. If you have an auto its probably 3.42 or 3.73, and with a nmanual its probably 2.73 or 3.08

    90K5
     
  15. GUMBY

    GUMBY Registered Member

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    What does the G80 designation stand for?
     
  16. Confederate9

    Confederate9 1/2 ton status

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    where in the glove box? my glove box has2 originall sheets of paper in it, and i dont knw where to look.

    Confederate's w/ K5's!
    '85 K5: BIG BAD AND MEAN
    "DONT BE PROUD IF IT AINT LOUD!"
     
  17. OFFRDK5

    OFFRDK5 1/2 ton status Premium Member

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    I went through my glove box...I don't see anything that says what ratio it is. I took all my codes out and here they are....

    1AJ1
    1A33
    1B32
    1D45
    1G80
    1LH6
    1NK7
    1N33
    1UN3
    1V76
    1YE9
    1ZXN
    1Z58
    168L
    1AD5
    1AM7
    1B3J
    1C60
    1GQ1
    1K34
    1MXO
    1NY1
    1N67
    1U35
    1XXN
    1ZY3
    161W

    And my VIN is

    1G8EK18C1DF100433

    Its a 1983 6.2 Diesel. I can't find the axle RATIO in this goo...I know its a gov-lock...but no ratio listed [​IMG]

    SK-15
    J**P...it's whats for dinner!
    http://SK-15.coloradok5.com
     
  18. Rebel88

    Rebel88 1/2 ton status

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    Hey i got a question. My buddy has an 84 with the gq1 code in it. What is the ratio here? it also has the g80 govlok code as well. Can anybody help me out so i can let him know?

    Later

    Have you driven OVER a Ford lately?
     
  19. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    The GM Option code book I have says the following:

    GQ1- AXLE, STD RATIO

    I'm not sure what this means.............looks like you might have to the old tire spin method to find out for sure!!

    Want any other codes deciphered, SK-15?


    <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>
     
  20. 85k5blzr

    85k5blzr 1/2 ton status

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    Mine must just be different all together. In my glove box, it has the codes and what they are next to them and I am running the gov-loc with an auto and the crappy 3.08. I wish the person that i bought my truck from would have had enough sense to at least go to 3.73 cause 3.08 sucks with my 32"s.

    85 k5 blazer with an old 305....must have more power! [​IMG]
     

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