What problem could result from excessive CV joint angle?

Excessive CV joint angle can lead to noise upon acceleration due to the increased stress and potential binding in the joint. When the CV (Constant Velocity) joint is angled beyond its operational limits, it cannot maintain a consistent speed and allows for more abrupt movements within the joint. These abrupt movements can cause various components of the joint to collide or wear against each other more forcefully, resulting in noise during acceleration. The noise typically arises from the friction and potential impact between the internal components of the joint as they are forced to operate at angles that exceed their design specifications.

In assessing the other options, clutch slippage is typically associated with issues in the clutch system rather than the CV joints. Increased axle vibration could stem from balance issues or misalignment rather than specifically from excessive angles in the CV joint. Premature bearing wear is more related to overloading or lubrication failures rather than directly to CV joint angles. Thus, noise upon acceleration directly correlates with the stress on the CV joint when the angles are excessive.