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Speedometer gearing changed?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by blazingjesse, Apr 11, 2002.

  1. blazingjesse

    blazingjesse 1/2 ton status

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    I need to find where i can buy the gears for the speedometer for my 71 blazer now that if put a 1 inch lift and 33inch tires on it.
     
  2. Steve_Chin

    Steve_Chin 1/2 ton status

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    Gears for the transfer case are hard to come by. You might be better off finding a ratio adapter of the correct ratio to compensate. One with a 10% overdrive would fit the bill, unless there's a ratio adapter already in place (you should change the adapter to a different ratio if there's already one in place).

    FWIW, my '72 with 3.07:1 gears has a 20.202% overdrive ratio adapter on it (stock). If yours has the same ratio adapter, you need an adapter with a 22-23% overdrive to replace it.
     
  3. blazingjesse

    blazingjesse 1/2 ton status

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    yes, but where do i get one?
     
  4. Robin

    Robin 1/2 ton status

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    So I'm thinking about a new gauge set. Is an electric speedo (programmable) a solution (adapters available?)
     
  5. blazingjesse

    blazingjesse 1/2 ton status

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    I don't know about a programmable one , but i just replaced my speedo , and don't want to have to buy another one, i was hoping somebody knew where i could get the adapter.
     
  6. Steve_Chin

    Steve_Chin 1/2 ton status

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    Ratio adapters are available new from GM. They cost about $50 each, so do your math and get the right one.
     
  7. 69K5

    69K5 1/2 ton status

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    how do you find out which one you have? does it say on the box thing that screws into the transfer case

    nathan
     

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