I changed the trasmission fluid the other day. Bike had 2,230 miles, fluid (Syn 3) had about 1,600 on it. I could not believe the amount of metal particles attached to the magnetic drain plug! Started investigating on other boards and on Harley Tech Talk there was a current thread on this. Even mentioned that H-D has posted a technical service bulletin stating not to use Syn 3 in the transmission, though I have not seen the TSB myself, yet. I put Syn 3 back in since I had already purchased it, but may try Red Line heavy duty shockproof or Mobil 1 synthetic gear lube next time and see what the plug looks like with it. According to some of the folks in the HTT thread, switching to a gear-specific lube all but eliminated the particles on the plug.
Anyone else notice this?