700R4 Speedometer Drive Adapter

Discussion in 'Transmission & Transfer Case' started by johns87, Oct 9, 2018.

  1. johns87

    johns87 Junior Member

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    Joined:
    Aug 6, 2017
    Location:
    Orlando, FL
    First Name:
    John
    Truck Year:
    1987
    Truck Model:
    k10
    Engine Size:
    5.7
    I have an 87' with a 700R4. I recently replaced it and connected the speedometer cable thru the 90 degree adapter. The speedometer had been disconnected a few years back and it didn't work. Long story short traced it down to the adapter. I'm guessing the gears inside are shot as it will spin only on side.

    I connected the cable straight to the transmission and now the speedometer works, but with out the adapter it is off. The adapter shows a 1:0.90 ratio on it. So, I started trying to find one and seeming pretty hopeless. I've seen a couple on eBay but seems pretty expensive.

    Are there any other options? Oh here's an image what one looks like.

    [​IMG]
     
  2. 4WDKC

    4WDKC Full Access Member

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    First Name:
    Kacy
    Truck Year:
    1987
    Truck Model:
    V10
    Engine Size:
    350
    find the right gear for the tire size and gear ration you have. Install on the cable thing in the transmission.
     
  3. yevgenievich

    yevgenievich Full Access Member

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    Viktor
    Truck Year:
    1991
    Truck Model:
    V2500 burb
    Engine Size:
    5.7
    I just sold one on eBay for $50 couple of weeks ago. But I think sometimes adapter got used when exact gear combo was not available. Maybe could find better matching spedo gears or change tire size
     
  4. johns87

    johns87 Junior Member

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    Joined:
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    Location:
    Orlando, FL
    First Name:
    John
    Truck Year:
    1987
    Truck Model:
    k10
    Engine Size:
    5.7
    I'll give that a shot then, I appreciate it.

    I just wanted to make sure it wasn't needed for some reason I couldn't figure out.
     

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