Thumping sound coming from under the truck

85

Asked by Fredd76 Aug 05, 2012 at 01:41 AM about the 1996 Ford Explorer 2 Dr Sport 4WD SUV

Question type: Maintenance & Repair

Every time I start off i hear a thumping sound, or like a thudding sound coming from under the truck, it even jerks back a forth. After i reach higher speeds it stops, also after the truck seems to heat up it start to stop or is not as loud. I was wondering if it could be the U joints

2 Answers
74,270

OJ answered 12 years ago

It's a possiblity and would be the first thing I would check because it is the easiest. It could also be the transmission. Or maybe a motor mount. Or maybe the ring and pinion in the rear end.

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74,270

OJ answered 12 years ago

Does the thump only happen when you start the engine and put it in gear? Start the engine but leave it in park and let it idle. If there is no thump you can probably eliminate an internal engine problem. If it thumps while at idle, begin checking motor mounts and belt driven accessories.

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