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What could the problem be if you recently went out in some thick mud and now when driving over 40 mph wheel wobbles whole car shakes?

There are several potential causes for a wheel wobble and whole-car shaking at speeds over 40 mph after driving through thick mud. Here are some possibilities to consider:

1. Mud Build-up on Wheels and Tires: Driving through thick mud can cause mud to accumulate on the wheels and tires, especially on the inner surfaces. This additional mud can affect the wheel's balance, causing vibrations and shaking at higher speeds.

2. Damaged Wheels or Tires: Driving through thick mud can put stress on the wheels and tires, potentially causing damage such as bends or bulges. These irregularities in the wheels or tires can lead to wobbling and shaking at higher speeds.

3. Mud Caked in Brake Parts: Driving through mud and water can also lead to mud caking or clogging the brake components. This can affect the effectiveness and balance of the brakes, causing the vehicle to shake or wobble.

4. Damaged Suspension Components: Driving over rough terrain or through thick mud can put stress on the vehicle's suspension components. This can cause damage to components like shock absorbers, struts, control arms, or ball joints, leading to wobbling and shaking.

5. Loose Lug Nuts: If lug nuts are not properly tightened after wheel-related work or tire changes, they can come loose and cause the wheels to wobble or come off.

6. Driveline Issues: Issues with the driveline components like axle joints, driveshafts, or differentials can also cause wobbling and shaking.

To address this issue, it is recommended to thoroughly clean the wheels and tires, paying particular attention to the inner surfaces. If the problem persists, it is advisable to inspect the vehicle for any visible damage or issues. Seeking the assistance of a professional mechanic or taking the vehicle to a reputable service center for inspection and repair is recommended to ensure safety and proper functionality.