Why rear wheels turn if front halfshaft broken on 4x4?

The rear wheels of a 4x4 vehicle will turn if the front halfshaft is broken because the vehicle's drivetrain is designed to transfer power from the engine to all four wheels. When the front halfshaft is broken, the power from the engine is still transferred to the rear wheels through the driveshaft and rear differential. This allows the vehicle to continue to move even though the front wheels are not turning.

Here is a more detailed explanation of how the drivetrain in a 4x4 vehicle works:

* The engine generates power, which is sent to the transmission.

* The transmission transfers the power to the transfer case.

* The transfer case splits the power and sends it to the front and rear differentials.

* The differentials distribute the power to the left and right wheels.

When the front halfshaft is broken, the power from the engine is still transferred to the transfer case and then to the rear differential. The rear differential then distributes the power to the left and right rear wheels, which allows the vehicle to continue to move.

It is important to note that driving a 4x4 vehicle with a broken front halfshaft can be dangerous. The vehicle may be more difficult to control, and it may not be able to stop as quickly. If you suspect that your vehicle's front halfshaft is broken, you should have it repaired as soon as possible.