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  1. #1

    Question 1987 Sierra Classic Speedometer

    My Sierra Classic has been sitting in the grass for almost two months, and the reason why is because my speedometer is no longer working. First it was off by almost exactly 10 mph, and then after a while, it started to flicker up and down till it finally quit. I was wondering if anyone has had similar problems and if there's any easy fixes/ common causes.

  2. #2

    Question 1987 Sierra Classic Speedometer

    About two months ago my speedometer for my 1987 Sierra Classic started flickering up and down until it finally quit alltogether. I was wondering if this was a common issue and if there was an easy fix.

  3. #3
    murdog94's Avatar
    Join Date
    Feb 2008
    Cloquet, Minnesota, United States
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    ********Threads merged********


    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  4. #4
    stephan's Avatar
    Join Date
    Sep 2010
    Far West, Oregon USA,
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    Hey Glen, do you know if this is an electric speedo or a cable driven one? They used both back in those years. If it's cable driven then lubeing the cable & the speedo head usually stops the jumping, but if it's finally stopped at this point then maybe the cable finally broke from the resistance. If it's the electric type then maybe it's the stepper motor for the speedo, if they used them back then. Mike ('99HEARTBEAT) is really good on the stepper motors, so if he doesn't see this thread, & if you determine that it's electric send him a p. message.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  5. #5
    Jr. Apprentice jt1200r's Avatar
    Join Date
    May 2011
    Huntingtown MD


    mine only jumps when its cold
    87 r10 stepside

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