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Dyna Glide ModelsSuper Glide, Super Glide Sport, Super Glide Custom, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.
Are you cruising at that RPM range? If so yes, it will vibrate, you are lugging it. It is not unusual for it to "vibrate" at the RPM range it is not designed to cruise there.
Ideal range is 2500-3000 RPM, does it run smooth in that range?