1999 Peterbilt 379 Speedometer Bounces

Discussion in 'Peterbilt Forum' started by rslivelyjr, Dec 8, 2023.

  1. rslivelyjr

    rslivelyjr Bobtail Member

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    Ok on my truck when you put it into gear from neutral, the speedometer will jump from 0 to whatever , 30 40 50 , also the speedometer is new the old one went out , also it only reads half of my speed , also the sensor is new on the drive shaft . Anyone have clues ! Thanks

    Detroit 60 12.7
     
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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    I would tighten the yoke nut first
     
    circle h Thanks this.
  4. rslivelyjr

    rslivelyjr Bobtail Member

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    It is tight checked it
     
  5. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    How did you check it?
     
  6. rslivelyjr

    rslivelyjr Bobtail Member

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    Boss man crawled under it over the weekend and checked it what he said not sure how he did . Just said it’s ok
     
  7. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Does your cruise work?
     
    circle h Thanks this.
  8. rslivelyjr

    rslivelyjr Bobtail Member

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    No cruise no Jake’s , been trying to figure that out computer says all sensors are working and we checked clutch and brake sensors they are good
     
  9. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    20$ says your boss is wrong
     
  10. circle h

    circle h Light Load Member

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    There are a set of dip switches on the back of those speeds. If they aren't set correctly they do all kinds of funky stuff. Showing half speed is a sign that it's not set correctly. If you search online you can find the setting listings.
     
  11. rslivelyjr

    rslivelyjr Bobtail Member

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    So could that stop my Jake’s and cruise ?
     
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