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Thump in driveline on acceleration
1999 Ford F-350 Super Duty

Thump in driveline on acceleration

(1999 Ford F-350 Super Duty)
It's been going on for some time but seems to be more previlent while pulling my 5th wheel or utility trailer. I can feel a thump through the seat when I take off from a stop. It feels like a driveline but have not been able to nail it down. I was told the springs on this year truck may be bad. Have you seen or heard of this problem?
in Coeur d Alene, ID on May 22, 2011
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on May 22, 2011
A spring issue would be more continual and intermittent, not dependent on thumping on acceleration.

I would stop and have a look at the universal joints on the drive shaft. Have a look front to back - from the extension housing of the transmission all the way back to the rear end. I believe this vehicle also has a center support bearing in the drive shaft - this could also make noise.
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General Diagnosis
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on May 22, 2011
A spring issue would be more continual and intermittent, not dependent on thumping on acceleration.

I would stop and have a look at the universal joints on the drive shaft. Have a look front to back - from the extension housing of the transmission all the way back to the rear end. I believe this vehicle also has a center support bearing in the drive shaft - this could also make noise.
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