If the drive shaft angle is misadjusted after maintenance, what symptom would you most likely observe?

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When the drive shaft angle is off after maintenance, the U-joints can no longer rotate smoothly through their range because the shaft isn’t aligned with the axle and transmission that drive it. This misalignment causes cyclic fluctuations in the torque transmitted through the driveline, which shows up as vibration that’s noticeable at speed as the drivetrain harmonics couple into the chassis. The other symptoms aren’t the typical result of changing the drive shaft angle: a soft clunking noise usually points to a loose or worn joint or other component; an oil leak from the differential comes from seals or improper sealing; steering wheel vibration generally stems from wheel/tire or steering system issues rather than driveline angle. So the most likely observed symptom is vibration.