When does the drive shaft and yokes need to be marked before disassembly?

• A. To prevent vibration
• B. To balance components
• C. To identify parts
• D. To improve lubrication

Answer: (A)

Preserving the original orientation of the driveshaft and yokes is essential so that the joints reassemble in their proper phasing. If you don’t mark them, the yokes or slip joint can be put back in a different relative position, which disrupts balance and alignment and often causes vibration once the vehicle is moving. Marking is not about identifying parts or improving lubrication, and balancing is a separate process done to address overall shaft balance, not just to guide reassembly. So marking before disassembly helps ensure the driveline goes back together with the same orientation, preventing vibration.