Hello, welcome to JustAnswer.
The ticking noise is coming from the motor, or the drive?
If it is coming from the drive, the noise would have to be the very early sound of a U-joint beginning go fail, or a chipped gear. The problem with that, is a ticking noise isn't something a drive generally does. Their noises tend to be more solid.
Could you perhaps try to Identify for certain where this noise is coming from so I don't end up having you chasing around your boat?
I know finding noises can be difficult, hard to pinpoint. One trick to doing so is to use a short length of hose like a stethoscope. It sounds silly, but it really does work.
If these are new drives, it's not the u-joint. Nor is it likely the gears if the drive lube bottles are full.
On the side of each gimble ring is a grease fitting (outside the boat). This fitting is to grease the gimble bearing. I would give that fitting 5 pumps of a grease gun and see if it doesn't make that sound go away. Do both engines' bearing.
If that doesn't solve the problem you are going to need to get the bearing checked, as well as the engine alignment checked. This should have been done when the new drives were put on, but it gets over looked especially when new drives are being put on under warranty.
This should be covered, by the way, though they are going to fight you on it.
The drive lube bottles have NEVER fallen out of level range. I know which fittings you are talking about. Does the boat need to be out of the water to lube these bearing or can a diver do the procedure for me?
I'll discuss the matter with my local authorized mercury marine shop if additional work is required.
Thank you James! You were a BIG help