Tire and Wheel Related:
* Tire Balance: This is the most common cause. Unbalanced tires will cause vibrations, especially at higher speeds. Have your tires professionally balanced.
* Tire Rotation: Uneven tire wear can also cause vibrations. Ensure your tires are rotated properly according to the manufacturer's recommendations.
* Tire Condition: Worn, damaged, or improperly inflated tires can vibrate. Check the tread depth, look for bulges or cuts, and ensure proper inflation pressure (check the sticker on your driver's side doorjamb).
* Wheel Alignment: Misalignment can cause uneven tire wear and vibrations. Have your alignment checked and corrected by a professional.
* Bent Wheel: A bent wheel is a serious issue that can cause vibrations and affect handling. Inspect your wheels carefully for any bends or damage.
* Loose Wheel Lug Nuts: Make sure all lug nuts are properly tightened. Loose lug nuts can cause serious safety issues and vibrations.
Drivetrain Related:
* Driveshaft: A worn or damaged driveshaft can cause vibrations, especially at higher speeds. This requires professional inspection.
* U-joints: Universal joints (U-joints) in the driveshaft can wear out and cause vibrations. A clicking sound might accompany the vibration.
* Transmission Problems: Problems within the transmission can manifest as vibrations. This is a more serious issue requiring a professional diagnosis.
* Differential Problems: Issues with the differential can also cause vibrations, particularly at higher speeds. This often involves noises along with vibrations.
* Wheel Bearings: Worn wheel bearings will produce a rumbling or growling noise often accompanied by vibration, particularly at higher speeds.
Other Potential Causes:
* Engine Problems: While less likely to cause *only* high-speed vibration, serious engine issues *could* contribute.
* Suspension Components: Worn suspension components (ball joints, tie rod ends, etc.) can affect handling and potentially cause vibrations, but usually more at lower speeds or during turns.
Troubleshooting Steps:
1. Start with the simplest: Check tire pressure, inspect tires for damage, and ensure lug nuts are tight.
2. Get a professional balance and alignment: This is crucial even if you think the problem is elsewhere. An unbalanced tire will mask other issues.
3. Listen carefully: Does the vibration change with speed? Is there any accompanying noise (humming, clicking, growling)? This helps narrow down the potential cause.
4. Professional Inspection: If the problem persists after checking the basics, take your Aerostar to a qualified mechanic for a thorough inspection. They have the tools and expertise to diagnose the issue properly.
Ignoring vibrations, especially at high speeds, can be dangerous. Don't delay getting your vehicle checked if the problem continues. The cost of repair is far less than the cost of an accident.
