Which of the following is NOT a type of ball joint?

The choice indicating "Adjustable torque" is not a type of ball joint is correct because ball joints are primarily categorized based on their design and function related to vehicle suspension systems. The standard types include standard ball joints, which are the most common, wear indicator ball joints that have a feature to show wear levels, and preloaded ball joints designed to maintain tension for better performance and longevity.

Adjustable torque, however, does not fit within these standard classifications. Ball joints themselves are used to connect the vehicle's steering and suspension components and allow for smooth motion in multiple directions. The other options represent actual modifications or features that relate to the performance or wear of ball joints. In contrast, "adjustable torque" refers more to an adjustment mechanism not related to ball joint technology, thus making it the correct response to the question posed.