Vibration Need Help

[cajun72blazer]

Once I get above 50mph the vibration starts. Vibrations is not only through the steering wheel, but the whole truck. If I let off the gas the vibration stops and the trucks is still moving over 50mph, but if I get back on the accelerator the vibration starts again. No problems under 50mph.

Any ideas? Where to start?
/forums/images/graemlins/1zhelp.gif
Blake
http://blakesara.home.comcast.net/K5Photos.htm

 

[Greg72]

Any recent suspension changes....like a lift kit?

I want to say driveshaft vibration, but it seems like the vibe should still exist under "coast" conditions??? /forums/images/graemlins/thinking.gif

 

[JIMs70K25]

Could be a couple things, driveshaft for one. Does it go away when you get above 50 say 65? I'd say tire balance. Could be a u-joint that's usually under acceleration and goes away when coasting. Checks these out and let us know.

 

[cajun72blazer]

No suspension changes. I am going to have to check the vibration up at higher speeds and see if the vibration progresses. I will try the easy fix first and stop by a tire shop and have the tires balanced.
I am was guessing the U-joints, because when coasting the vibration stops.
I guess we will see tomorrow.

Thanks,
Blake

 

[Triaged]

Did some punk kids lock your hubs or are they sticking?

I like d-shaft as the best bet...other things will be fairly obvious on a lift a being real loose.

 

[cajun72blazer]

Problem found - Bad u-joints on drive shaft.
Thanks for your help.