Originally Posted by Joeh
The vent plug does not have a magnet.
But the fluid that came out was full of metal.
I will check in the morning about noise change in gear.
I've never seen a Bravo 3 drain plug that was not magnetized. The vent plug (upper) and the drain plug (lower) are the same, but metal wouldn't collect at the vent plug. The metal settles to the bottom of the drive after it has been sitting for a while (cold) and should get attracted to the lower drain plug.
Was the engine run for some time prior to draining the lube? That would disperse the metal shavings throughout the lube.
If I were to guess, I'd say you're bearings are shot, and needles are failing and getting ground in the gears like a coffee grinder. This begins to cause shearing of the gear teeth. Over time, there are more metal shavings and the noise grows not just because of the bearings, but also the grinding of the shavings in the gears.
I hit a submerged object a few years ago and sheared a tooth on an upper gear. That made one heck of a racket.