Here are some of the most likely culprits:
* Worn or damaged tie rod ends: These connect the steering rack to the wheels. Wear or damage can cause uneven steering and violent shaking.
* Worn or damaged ball joints: These allow the wheels to move up and down. Worn ball joints can lead to similar symptoms.
* Worn steering linkage: Any component in the steering linkage (including the idler arm, pitman arm, etc.) can cause shaking if worn.
* Uneven tire pressure: While less likely to cause *violent* shaking, significantly different tire pressures can contribute. Check and inflate to the correct pressure (listed on a sticker inside the driver's side doorjamb).
* Bent wheel: A bent wheel will cause vibration and shaking, especially at higher speeds. Look closely at your wheels for any obvious bends.
* Worn or damaged wheel bearings: Worn wheel bearings will create a rumbling or shaking sensation, often worse at higher speeds.
* Problem with the steering rack: A damaged or worn steering rack itself could be the source of the problem.
* Uneven brake wear: While less common, significantly uneven brake pad wear can affect steering.
What you should do:
1. Do NOT drive the van: This is crucial for your safety and to prevent further damage.
2. Have it towed to a mechanic: A qualified mechanic can properly diagnose the problem. Describe the symptoms (violent shaking, feeling like the wheels are fighting each other) clearly.
3. Get a thorough inspection: Don't just ask them to "fix the shaking." Ask for a complete inspection of the steering and suspension system.
Ignoring this problem is dangerous. The violent shaking indicates a significant issue that needs immediate professional attention. The cost of repair will likely be less than the cost of an accident.
