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  1. #1

    Default 1980 k20 Speedo Inop (pics & q's)

    Hello everyone!
    my 1980 3/4 ton 4x4 with manual trans has a speedo that is not working.
    I replaced the speedo cable and got nothing, next I assume would be the drive gear but when i crawled under, I did not see one on the t-case, instead I found this curious looking item of which I am not familiar with yet.. Can anyone tell me what this is, and if it contains my speedo gear>? Thanks in advance
    Click image for larger version. 

Name:	2012-03-11 15.02.41.jpg 
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  2. #2


    Looks like a ratio adjuster. It's just a set of gears that slow down or speed up the cable. There should be a plastic speedo gear on the output shaft of the transfercase. They wear out and strip the teeth.

    97 Chevrolet Suburban K1500 5.7L
    78 GMC High Sierra K1500
    Fat, drunk, and stupid is no way to go thru life.

  3. #3


    Thanks for the reply Boonduff.
    I hooked it back on and speedo worked for a few minutes, I found some play in the uinit i posted above and i think it may be my issue?

    grr i DO not know whats going on..

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