Why might the inboard boot on one side be stretched and torn, while the other side is compressed?

The correct answer highlights the role of motor mounts in maintaining proper alignment and positioning of the engine and transmission within the vehicle. When motor mounts are worn or damaged, they may not adequately support the engine, leading to excessive movement during operation. This excessive movement can cause one half-shaft (or axle) to pull farther than intended, resulting in the inboard boot being stretched and potentially torn. In contrast, the opposite half-shaft may be more compressed due to misalignment caused by the loose engine positioning.

This situation often presents itself when there is a significant difference in the positioning of the half-shafts, which could result from uneven forces acting upon them due to the engine's lack of proper support. Therefore, observing one side with a stretched and torn boot and the other with a compressed boot can indicate that motor mounts are failing to keep the engine stable, leading to abnormal axle behavior.

In contrast, half-shafts installed backwards would likely not create such an asymmetrical scenario with boot condition. Similarly, while bad CV joints may contribute to boot damage, they typically do not explain the distinct differences observed in the condition of both boots. A misaligned cradle could cause issues as well, but it typically would not explain the particular situation of one