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spedometer correcting boxes

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by R72K5, Apr 6, 2002.

  1. R72K5

    R72K5 Banned

    Mar 5, 2001
    Likes Received:
    central IL
    i came across one of those speedometer add on units that goes on the tranny or case before the speedo cable goes on, it has some numbers stamped in it: 777 F1 3000BH
    how can i find out more about it ? anyone have good info on these and how many MPH they calibrate or reduce or correct ?


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