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What would cause heavy vibration at higher speeds when not accelerating?

1. Driveline Problems:

Worn or damaged driveshafts: If your driveshafts are worn or misaligned, they can cause the vehicle to vibrate at higher speeds.

Faulty universal joints: Universal joints connect the driveshaft to the differential or axles and allow the driveshaft to flex as the suspension moves. If they're worn or damaged, it can cause vibration.

2. Wheel and tire issues:

Unbalanced wheels: Unbalanced wheels can cause vibration at high speeds. Regular wheel balancing is essential to prevent vibrations.

Incorrect tire pressure: Over-inflated or under-inflated tires can affect vehicle stability and cause vibrations.

Damaged or broken tire belts: If your tire belts are damaged or broken, it can cause a severe vibration at a higher speed.

3. Engine Problems:

Spark plug issues: Worn or fouled spark plugs can cause engine misfires, which can lead to vibrations.

Faulty ignition coils: Faulty ignition coils can also cause misfires and vibrations.

4. Transmission Problems:

Low transmission fluid: When the transmission fluid level is low, it can lead to problems engaging gears and can cause vibrations.

5. Suspension problems:

Worn or damaged suspension components: If your suspension components are worn or damaged, they can't effectively absorb road bumps and vibrations. Worn-out shock absorbers, struts, ball joints, and control arm bushings are common culprits.

Damaged wheel bearings: If the wheel bearings are worn out or damaged, they can generate significant vibration, particularly at higher speeds.

It's crucial to have your vehicle inspected by a qualified mechanic if you're experiencing heavy vibrations at higher speeds. Neglecting these issues can worsen and potentially lead to more severe problems and compromising your safety and the vehicle's performance.