KZ1100-A2 Bevel Drive

Hello all, I'm going to work on the Bevel drive on my KZ1100-A2 this winter. The last couple of rides this fall there was a real buzzing bearing noise that showed up under deceleration. It didn't make any noise under acceleration but showed up when i would let off the gas. My bike is high mileage 80,000 plus,so it's time i guess. What i would like to know is there going to be any surprises? I have the service manual for it so i have a good idea what's involved.
Thanks for reading this, Cheers, Jerry

if you have the service manual it should be fairly straight forward i don't think you will run into any major snags