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What gears?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by big pappa b, Jan 7, 2003.

  1. big pappa b

    big pappa b 3/4 ton status

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    I just bought an 80 Blazer 4x4 with a 6 cyl and 3 speed manual trans. Any ideas what gears the factory would put in the front/rear axles?
    /forums/images/graemlins/confused.gif
     
  2. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> 4.10s are highly likely. There should be a tag under one of the diff cover bolts that will tell you, unless someone removed it. There's some other ways to tell, but this is the easiest. </font color>
     
  3. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    Also I have seen in an '85 in the glove box listed the gear ratio in the options list.
     
  4. BowtieRed

    BowtieRed 1/2 ton status Author

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    if you cannot find it- jack the rear up. put a mark on the tire and line something up with it. trn the yoke and count the number of rotations before the mark on the tire lines up with what you lined up with it. if it's a little over 4, then it's probably 4.10, if it's 4 1/2 then 4.56, almost 5, then 4.88. . . and so on.
     
  5. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> Those would be 2 other ways to tell, but like I said, the tag is the easiest. /forums/images/graemlins/thumb.gif The last way to find out is by pulling the diff cover and checking the stamp on the edge of the ring gear. This, for obvious reasons, is also the most accurate way. /forums/images/graemlins/grin.gif </font color>
     
  6. Sandman

    Sandman 3/4 ton status Author

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    The 6 cyl usually meant lower gears. Not a bad deal at all.
     
  7. OL14BLAZ

    OL14BLAZ 1/2 ton status

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    Get the VIN number off the truck and call your local Chevy dealership parts dept. and tell them the number and they will be able to tell you what ratio you have in that truck, as long as it is the orginial one /forums/images/graemlins/thumb.gif

    Eric /forums/images/graemlins/usaflag.gif /forums/images/graemlins/k5.gif
     
  8. imiceman44

    imiceman44 1 ton status

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    Actually when you do the rotating tire test, you have to double the number you get since the one wheel turning will ride the pinion gears at half the speed. So one turn of the wheel will give you almost 2 turns of the driveshaft for 3.73, a little more than 2 fr the 4.11, 2 1/4 turn for 4.56
    I believe these will be the only options that came stock with a six cylinder.
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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  10. R72K5

    R72K5 Banned

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    dyeager, wow ! nice collection of brochures ! /forums/images/graemlins/laugh.gif!
     

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