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'Thud' noise in drive line when starting off.

hoorders

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hoorders Enthusiast

hoorders

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Hey everyone, Just noticed my yukon having this 'thud' sort of noise when I leave from a stop. Now if the road is flat with no dips or anything it doesnt make the noise. It just happens to do it if there is a dip in the road and the suspension flexes down some. It only does it once though. Until I come to a stop again and start off again.....it feels and sounds just like the slip yoke sticking problem the GMT800 trucks experienced.

Anyone have any ideas or had this issue with their GMT400's?

 

Thanks!!

92rado Enthusiast

92rado

Posted
Posted

Friend had a 96 z71 that did this. It ended up being the rear brakes were not releasing as quickly as the should. I can't remember what caused them to do that but I believe they were either out of adjustment or the wheel cyls were going bad.

  • 4 weeks later...
Wolfmanjohn Enthusiast

Wolfmanjohn

Posted
Posted

This may sound off the wall, but is the spare tire fully inflated and cinched tightly to the frame? Had the same sound once on my '99 'Hoe, and it was a loose spare moving around on acceleration and bouncing off the frame.

hoorders Enthusiast

hoorders

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  • Author
Posted

The spare tire in my yukon sits inside the truck. Im going to pull the rear wheels off and see if the back shoes are indeed sticking.

alz Enthusiast

alz

Posted
Posted

Lube the slip yoke on the driveshaft. Check the u-joints while you have it down.

  • 2 weeks later...
hoorders Enthusiast

hoorders

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  • Author
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Ya I have to pull the drive shaft and grease the slip yoke to see if that cures it.

 

Thanks!!

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