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Speedometer wont work, HELP!

Discussion in 'Truck & Equipment Repair' started by thesnowman269, Aug 30, 2010.

  1. thesnowman269

    thesnowman269 Senior Member
    Messages: 954

    I recently swapped over the majority of the drive train from my old truck to my new one, the old one being a 98 f250 light duty, the new being a 99 f150, the swap included the transmission ( the new truck (the 99) was converted from an automatic to a 5spd) I cannot see the speedo sensor gears being off because the transmission and rear axle came out of the same truck. Im lost I have no more trick I cant figure it out
     
  2. Rc2505

    Rc2505 PlowSite.com Addict
    Messages: 1,245

    I just had a problem with the speedo in my 96 F-250. I looked at it for a couple days on and off, finally decided to take it to a shop. They found a wire broken off at the fuse panel, which operates the speedo. You might want to find a chiltons, and try that. Good Luck
     
  3. thesnowman269

    thesnowman269 Senior Member
    Messages: 954

    Well you see this is the strange thing, the spedo works. However at highway speeds its only at about 20 mph. so there is an electrical conection, I think I just have to have my computer reprogramed
     
  4. Milwaukee

    Milwaukee 2000 Club Member
    Messages: 2,180

    First get vss sensor out rear axle and clean

    Make sure there no dielectric grease in connector plugs they mess AC current to speedometer.


    If you was near I would come to help you.
     
  5. thesnowman269

    thesnowman269 Senior Member
    Messages: 954

    vss sensor? Iv'e never even heard of that but I think I know what you are talking about. I will check it tomorrow
     
  6. Milwaukee

    Milwaukee 2000 Club Member
    Messages: 2,180


    Look top of rear axle

    it have electric wiring to top that is vss sensor.
     
  7. Milwaukee

    Milwaukee 2000 Club Member
    Messages: 2,180

  8. thesnowman269

    thesnowman269 Senior Member
    Messages: 954

    Yup that thingy, I figured that was it as its the only electrical connection on the axle, is it possible it is not getting enough conectivity and thats why it is so off?
     
  9. hydro_37

    hydro_37 PlowSite Veteran
    from iowa
    Messages: 3,790

    VSS = Variable Speed Sensor
    just clean it and reset your trucks computer (Take the neg battery terminal off...turn the lights on and wait for 30 mins and then reconnect the terminal_