Check your strut mounts, and front struts, my 2004 cadillac deville did the same thing between 67 and 75mph and after time it shook between 58 to 80mph, and it was the front strut mounts were egged out, and front struts were weak. I had my tires balanced, wheel bearings replaced, and it didnt help.
SOURCE: front end vibration
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.
SOURCE: 98 chevy astro front end vibrates and shakes at 65 mph
You may have to get your wheels re ballanced if you lost one of the weight's on the rim. The other thing to is a bent rim if you hit a large pot hole or crub and last to see if the tire it self has funny wear patterns on the treads.
Other things to look for if your wheels are ok.
Check the ball joints
Check the tie rod ends
Check and pay attention to the Idler and Pitman arm.
Your looking for any excessive movments
A good way is to grease all that is mentioned above and see if the vibration is gone.
Lost thing would be the brake rotors but you'ld now that by having vibrations throught out any speed when you apply the brakes to slow down.
Good luck and hope this helps, you should be able to do this on your own other then checking the wheel ballance.
SOURCE: front end vibration
sounds like you got the D.W (death wobble)
It is usually caused by either a bad tire,an off balanced, worn bushings, bad tracbar or loose steering components.
SOURCE: Vibration in the front end when you get to 25 mph
Could be many a things, for example:
Front wheel bearings
Warped Brake Disc
Worn suspension mounts
CV joint needs replacement
Worn bushes
Worn/bent steering rods
Wheel weight balances have come off and caused irregular wheel balance
Wheels are warped, damaged
Brake pads are worn over the limit
I would really recommend you take it to a professional to take a look. It could be very dangerous to you and other drivers using the road
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My 2004 DeVille exhibited same symptoms and the mechanic found the rubber bushings in the front lower control arms (both sides) had deteriorated to the point that the arms actually rattled on their bolts. Imagine that. Only 201,000 miles and the rubber bushings were worn out. Just don't make stuff like they used to! LOL Seriously though, I had them replace the lower control arms and the struts (also original OEM units BTW !!).
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