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Axle code help - gears

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Todd78/87, Mar 5, 2000.

  1. Todd78/87

    Todd78/87 1/2 ton status

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    Ok K5'ers my axle rear axle tube has 3896839 with an N under it and the other side says GM86
    This is on my 78 w/10 bolts axles,,, what gears do I have assuming they have never been swapped out?
    Thanks

    Todd 78/87[​IMG]
    [​IMG]
     
  2. Goose

    Goose 1/2 ton status

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    Aren't you in the process of working on your front diff. I thought I saw a pic with the front diff cover off. If you want to know your gear ratio you can do two things. On the outside of the ring gear the ratio will be stamped. It will show something like 38:11. The larger number will be the number of teeth on the ring gear, the smaller the number on the pinion. You could also physical count the individual teeth. Simply divide the numbers (3.45 in this case) and that's your ratio. The rear will match from the factory. If they don't match, you would have known it by now if you ever had it in 4x4 on a hard surface.

    ...................uh can't think of anything clever
     
  3. DangerB

    DangerB 1/2 ton status

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    You can raise the back end, mark the reare driveshaft/mark the tire, spin tire. Number of times it takes the driveshaft to turn the tire 1 rev is your ratio. example:3-3/4 revs would be 3.73:1. Kinda primitive, but gives you an idea.

    DangerBrett[​IMG]
    <font color=blue>life is a race, you have to look good and go fast!</font color=blue>
     
  4. Blazer79

    Blazer79 1/2 ton status

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    When doing that 'primitive' procedure, you'll have to turn the wheel two full turns, not one. I made that mistake too[​IMG].

    <font color=purple>////////
    Go 79s!!!
    </font color=purple>[​IMG]
     
  5. Todd78/87

    Todd78/87 1/2 ton status

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    Yeah,, I was in there,, but some dumb ass put the cover back on before he looked!!! [​IMG]

    Todd 78/87[​IMG]
    [​IMG]
     

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