Have a 2015 Viking Vi. Had a bad vibration when “cruising” around 13 mph. Thought it was in rear diff so replaced whole diff due to a bent axle and lots of metal in diff. Then upgraded to JBS hot rod sheave. Finally got back to riding again and it’s still there. Around 13 and over at cruising rpm under minimal engine load seems something starts to bind, and can feel vibration throughout. Also robs some power. Now if I completely let off the throttle and get back into it, it’s fine until back at a cruise rpm with minimal load.