Most Common Causes:
* Tire Problems: This is the most frequent cause. Check for:
* Uneven tire wear: Look for bald spots, cupping, or feathering. Rotation and possibly replacement are needed.
* Tire balance: Imbalance in one or more tires is a major contributor to shaking. A tire balancing machine at a tire shop is essential for this.
* Bent rim(s): Inspect rims for bends or damage. A bent rim can't be balanced properly.
* Incorrect tire pressure: Check and inflate tires to the manufacturer's recommended pressure (found in your owner's manual or on a sticker inside the driver's side doorjamb).
* Wheel Bearing Problems: Worn wheel bearings can cause vibration, especially at higher speeds. You might also hear a humming or rumbling noise. A mechanic can diagnose this by inspecting the bearings.
* Drivetrain Issues: Problems in the drivetrain can transfer vibrations to the car's body. This could include:
* U-joints: Worn universal joints in the driveshaft can cause shaking.
* Drive shaft: A bent or damaged driveshaft can cause vibrations.
* Transmission problems: Though less likely to cause shaking specifically at 60 mph, transmission issues can create vibrations.
* Brake Problems: Warped rotors or sticking calipers can cause vibration, often felt most strongly through the brake pedal, but it can also be felt in the steering wheel or through the car's body.
* Suspension Components: Worn or damaged suspension parts can lead to vibrations. This includes:
* Ball joints: Worn ball joints cause sloppy steering and vibrations.
* Control arm bushings: Worn bushings allow excessive movement and can cause vibrations.
* Shocks/Struts: Worn shocks or struts will reduce the car's ability to dampen vibrations from the road.
Troubleshooting Steps:
1. Start with the tires: This is the easiest and cheapest check. Inspect the tires visually, and then have them balanced and the pressure checked.
2. Check for any obvious signs of damage: Look for anything unusual under the car (leaks, loose parts, etc.).
3. Test drive: Pay attention to *when* the shaking occurs (only at 60 mph? Does it change with braking or acceleration?). This will help narrow down the possibilities.
4. Professional Inspection: If you can't identify the problem yourself, take the car to a qualified mechanic. Describe the problem accurately, including the speed at which it occurs. They have the tools and experience to diagnose the issue properly.
Safety Note: Driving a car with a significant vibration at highway speeds can be dangerous. If the shaking is severe, reduce speed and get the car checked as soon as possible. Don't attempt to drive long distances with the problem unresolved.
