"Thump" after acceleration

Discussion in '99+ 7.3L PowerStroke Engine & Drivetrain' started by TWHPaul, Jun 27, 2019.

  1. TWHPaul

    TWHPaul SDD Junior Member

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    I have a 2003 F250, 7.3L, with 150k miles on it.
    I use it to haul a horse trailer from time to time, other than that it is not my primary vehicle.
    This past week I drove it a few times, and when I let off the accelerator I hear sort of a knock, or a thump.
    It's only when I release the accelerator, it still has a good response when I accelerate, it's just the thump/knock when I let off the pedal.
    Any thoughts or suggestions?
     
  2. dvor316

    dvor316 SDD Junior Member

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    Most likely it is the driveshaft slip joint needs lubrication.
     

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