If your vehicle is showing whole car vibrates at specific speeds, here are the most likely causes and the parts you'll need to fix each one.
The most frequent cause of speed-specific vibration (usually between 50-70 mph). Normal wear or a lost wheel weight causes the tire assembly to wobble at high rotational speeds.
Hitting a pothole or curb can bend a rim or damage a tire's internal belts, causing a vibration that peaks at certain speeds even if the wheel is perfectly balanced.
If wheels or aftermarket spacers are not tightened evenly in a star pattern, or lack proper hub-centric rings, the wheel will not sit perfectly flat against the hub.
In RWD or 4WD vehicles, a failing universal joint or a dented driveshaft causes a high-frequency vibration that changes with vehicle speed and throttle input.
Worn inner CV joints often cause a side-to-side shudder or vibration that is most noticeable when accelerating at specific speeds (e.g., 40-60 mph) and goes away when coasting.
Loose suspension bushings or ball joints can amplify minor road imperfections or slight tire imbalances into a highly noticeable shake at highway speeds.
While typically characterized by a humming or roaring noise, a severely worn wheel bearing can introduce a vibration at higher speeds as the hub assembly develops play.