Why does my 2005 GMC Canyon Vibrate at 40mgh and Highway Speeds?

natalies

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Hello,
I have had my 2005 GMC Canyon for about 3 years. About 6 months ago it started to vibrate through the entire vehicle, not just through the steering wheel, it does it at 40mph, and at highway speeds, getting worse at 70mph. Then its WORSE when you let off the accelerator to coast or decelerate to 60mph. Its not getting worse, its just the same as it was when it started. Also, the vibration doesn't go away when you are at 60-70mph and you put the car in Neutral, the vibration is still there. When there is a full tank of gas or weight in the back of my truck the vibration is better. Help! I LOVE my truck. More info its a 4 wheel drive Z71 with 5 cylinders. Oh and we have replaced the furthest rear u-joint too thinking that was the vibration problem and it did not fix the vibration problem, it fixed the squeaking problem, but not the vibration problem.
 
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