Where did that rearend come from?
Too late now but the rear end should have been set over to one side not centered. Universal joints can recover a lot of Miss alignment .Not sure how much vibration it will cause, or how long it will last. A lot of trikes have offset driveshafts. Don't know if they are quite that far off. You could try 2 back to back Universal joints. or call a company called Borgeson .... http://www.borgeson.com/CONTACT.htm ...l tell them John Luciano from Torrington sent you .