I changed the rubber bushings / cups on the rear swing arm pivot shaft and now I have bad vibrations thru floorboards and seat. almost un ride able. I used the drag specialties parts. this thing is vibrating worse than my ironhorse hard tail did

 

Did you check the front?
Sometimes replacing one causes the others to be more prominent.

 

I did front as well, I actually have the front bolt loose at this point trying to isolate the vibration

 

Were the aftermarket bushings you installed a harder / stiffer (poly?) material that that can transfer more vibration then stock oem did?

Or if not that i'd look for something to do with reinstalling the swingarm and tightened everything down there was some (new!) metal to metal contact to something associated with the motor thats now sending excessive vibration from motor to the floorboards that wasn't going on prior to installing the new rear swingarm bushings.

Scott

 

I think I am going to pull the swing arm back apart paying close attention to the bushings and their contact points.

 

It was the front motor mount from drag specialties, I put the original 1 back in and she rides good again.