4070B shake, when driving 65

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, May 24, 2020.

  1. mile marker 27

    mile marker 27 Light Load Member

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    4070B has developed a shake and dribbling feeling, when approaching 65mph. Thought it was the king pins and they were bad, but drove it today and it didn’t eliminate the problem. It’s got pretty good steer tires but switched them out anyway with some other steers and it’s still is shaking/dribbling. Steering wheel as no slop in it and the truck doesn’t pull or wander. Feels like it under the driver’s floor board. Rear tires are 75% and soft. There’s no rattling or sounds when heavy braking either. I drove it with and without a trailer and it still does it. I know it’s a cab over so, I realize it’s not gonna ride like my long hood W9’s but I feel like there’s something to it.
     
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  3. AModelCat

    AModelCat Road Train Member

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  4. BoxCarKidd

    BoxCarKidd Road Train Member

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    My first go to is jack up the front end one side at a time. Put a block of wood close in front of the tire and spin the tire in reverse of normal rotation. Do that with the block centered and at an angle on both sides.
     
  5. "semi" retired

    "semi" retired Road Train Member

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    A 4070B that shakes? And a "dribbling feeling"? That's a new one for me. I don't understand what the problem is:biggrin_2559:. Might be the driveshaft lost a weight. If it happened all of a sudden, I'd check the obvious. Engine or trans mount? U-joints. If you feel it in your ###, it's probably the driveline. The Transtar I drove, which was about the only cabover I liked, shook from the time I left the yard, until I returned. And 65 mph? I'm proud of you!:thumbup: Got any pics of the old gal?
     
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  6. BUMBACLADWAR

    BUMBACLADWAR Road Train Member

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    Id probably go with checking u joints, like others said, and see if that drivers side shock is froze? Is it only from 62- 65 mainly?
     
  7. "semi" retired

    "semi" retired Road Train Member

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    Was it on a Monday? My 1st TT job driving a Mack, the boss said he got complaints, the trucks always rode rougher on a Monday, than on a Friday,,,:biggrin_2559:
     
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  8. mile marker 27

    mile marker 27 Light Load Member

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    DBE44DA0-EA0C-4EC8-AC1D-7188E81FFA63.jpeg
     
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  9. mile marker 27

    mile marker 27 Light Load Member

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    It may do it for split second at a few lower speeds but is very predictable from 62-65. Beyond 65, it will start to get smoother, sometimes.
     
  10. "semi" retired

    "semi" retired Road Train Member

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    Nice,,,by gar, that takes me back. I drove a truck just like that. They were the most popular truck of the 70's. Like I say, if the shaking is felt in your arms, it's coming from the front, in the seat, it's the driveline. While unlikely, might want to give those lug nuts a turn, but I'd bet it's the driveshaft.
     
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  11. mile marker 27

    mile marker 27 Light Load Member

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    It’s not shaking/bouncing through the steering wheel. It’s more like, from the seat and floor board. It’s more noticeable on the driver side. So, you’re thinking, an unbalanced driveline or bad u-joint?
     
    "semi" retired Thanks this.
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