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Why would the rear end of your car sway while driving on imperfect roads after you have 4 new tires and an alignment?

There are a few possible reasons why the rear end of your car might sway while driving on imperfect roads after you have installed 4 new tires and an alignment. Here are a few things to consider:

1. Tire Pressure: Check the tire pressure of all four tires to make sure they are inflated to the recommended level as specified in your vehicle's owner's manual. Incorrect tire pressure can affect the handling and stability of your vehicle.

2. Wheel Balance: Have the wheels balanced to ensure that they are evenly weighted. Imbalances in wheel weights can cause vibrations and swaying at certain speeds.

3. Suspension Components: Check the condition of your suspension components, including shock absorbers, struts, control arms, and tie rods. Worn or damaged suspension parts can affect the vehicle's stability and handling.

4. Alignment: While you mentioned getting an alignment, it is important to ensure that the alignment was done correctly. A misalignment, even a slight one, can affect the vehicle's handling and cause swaying.

5. Vehicle Load: Consider the weight distribution in your vehicle. If the rear end is heavily loaded, it can affect the vehicle's stability and cause swaying. Try to distribute the weight evenly throughout the vehicle.

6. Loose or Damaged Components: Check for any loose or damaged components in the rear suspension system, exhaust system, or drivetrain. Loose or damaged parts can cause unwanted vibrations or swaying.

7. Road Surface: Some roads may have uneven or rough surfaces, which can cause the vehicle to sway. This is not necessarily an indication of a problem with your vehicle, but it is something to be aware of.

If the rear end of your car continues to sway after addressing these factors, it is recommended that you take it to a qualified mechanic or automotive technician for further inspection and diagnosis. They will be able to identify the root cause of the problem and recommend the necessary repairs.