Thump/Slight downward pull after each gear?

Discussion in 'Questions From New Drivers' started by Lightning01, Jul 3, 2020.

  1. Lightning01

    Lightning01 Bobtail Member

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    Mar 7, 2020
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    8 speed manual Mack dump truck. So the truck is an 8 speed. From gears 1-4 there’s a slight jump whenever I take out the gear. So I’ll accelerate in each gear, as soon as I take out the gear, there’s a slight pull (downward jump) that you feel in the truck. You can feel it more if you accelerate harder. Also, in reverse, if I give the gas a quick step and let go, the thump is much more noticeable. It’s strange to explain it, but the closest explanation I can give is a downward left pull/jump. I’m not sure if this has to do with it, but at high speeds, there’s a bad trembly, loose sound/feeling coming from the engine area. It’s not the drive shaft because everything is in place, has new pieces, no play, etc. Any help is appreciated!
     
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  3. bad-luck

    bad-luck Road Train Member

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    Nov 16, 2013
    Baltimore, Maryland
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    Engine mount broken?
     
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  4. Shawn2130

    Shawn2130 Medium Load Member

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    Sep 20, 2015
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    This is a 1990 International Dump truck rear engine mount that broke.

    411C8F86-AB63-45B8-99CB-3C400A301414.jpeg

    Gear shifter dropped down and to the left towards the driver. Truck doesn’t move either as the dropped transmission pulled on the clutch linkage, releasing the clutch.

    Yours may be just bad rubbers.
     
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