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Re: front end vibration
To build upon what emissionwiz posted, the inner boot on the drivers side axle on the Grand Prix's seems susceptible to tearing. If this is the case you will see a greenish looking grease slug everywhere, even up on the bottom side of the hood.
I will second also that the CV joint can cause the vibration you speak of having personally experienced it in a Grand Prix.
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check the "u" joints for looseness and wear especially the front drive shaft . check sliding splines . The vibration is a harmonic vibration normally associated with worn "U" joints --bent or out of balanced ---worn /seizing slip joints or being excited by a failing drive thrust bearing in the diff. ( big bearing directly behind the pinion gear that takes all the load on drive) check the magnet on the diff drain plug for metal bits.
I had a similar problem. The dealer change automatic transmission and differential, but the noise continu.
After research on internet i think the problem is the front galiper who create a vibration on the disc wheel and the vibration frequence follow
the front axle until interior car.
Just press slowly the brake pedal and if the noise stop , that's it the cause i think.
I dont change my galiper, but i have a new transmission . :)))
It sounds as though your car has two seperate problems. The first problem with the vibration that goes away when you let off the gas pedal is caused by a bad INNER CV joint. It only vibrates when you are accelerating because that is when the joint is under stress. Your vehicle has two axles, each with an inner and an outer joint. My suggestion is to have a competent shop determine which is the bad side and replace the entire axle. The second vibration which occurs at any speed is most likely cause by either a bad tire, or a bent rim.