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1980 k20 Speedo Inop (pics & q's)

Discussion in 'GM Powertrain' started by Christopher A. Myers, Mar 11, 2012.

  1. 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
    2012-03-11 15.02.41.jpg
  2. Boonduff

    Boonduff Member 3 Years 100 Posts

    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.
  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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