Final answer:
The preferred tool for separating a U-joint from a driveshaft is d) a puller.
Step-by-step explanation:
The preferred tool for separating a U-joint from a driveshaft is a puller.
A puller is a specialized tool designed specifically for removing tight-fitting components, such as U-joints. It consists of a central screw or rod that applies pressure to the U-joint, forcing it out of the driveshaft.
Using a sledge hammer or a hydraulic jack is not recommended for this task. A sledge hammer could damage the driveshaft or other components, while a hydraulic jack is not designed for precision work and may not provide the necessary force to separate the U-joint.
A slide hammer is another tool that can be used for separating components, but a puller is generally more effective and easier to use for this specific task.