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What is the gear ratio for my 89 S-10 Blazer?

Discussion in '1983-2005 S-Series models' started by Ryan99Z28, Jun 25, 2002.

  1. Ryan99Z28

    Ryan99Z28 Newbie

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    I can't for the life of me find out what the rear axle gear ratio is on my 1989 S-10 Blazer. It is 2 wheel drive, 700r4 automatic, 4.3 liter, and came factory with 205/75/15s. I hope that is enough information. Please help me out if anyone knows. Thanks. Ryan.
     
  2. Triaged

    Triaged 1/2 ton status

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    I think the only 2 ratios are 3.42 and 3.73. You might be in luck and the tag might still be on the axle. If not just pop the pan off and look for the #'s stamped on the ring gear.
     
  3. Ryan99Z28

    Ryan99Z28 Newbie

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    Thanks for the info, I have checked that before and never found it. I did, however, after posting find the axle codes, so whenever I am home I will look up the axle code in the glove box and figure it out. Thanks.
     
  4. s10350power

    s10350power Registered Member

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    I had a 91 s10 blazer and it had a 4.3 with the 700r 4x4 and it had 308's i think but i dont think it had 373s
     
  5. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    You have to have 3.42...99% of 4.3/700R4 S-10's came with 3.42 Check for codes, I think GU8 is 3.42. Look on the tag in you glove box.
     
  6. steves89s10

    steves89s10 Newbie

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    Heres a list of the codes....

    GM8 = 2.56
    GU2 = 2.73
    GU4 = 3.08
    GU6 = 3.42
    GT4 = 3.73
    GT5 = 4.10
    HO4 = 4.11
    G80 = Posi
     

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