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Yes     KZQ   thats a 50s servi rear end.
I also would like to ask if you have weighed your trike at the tires?
Mine came out 176 pounds on the front tire and 258 on each rear.   I took these numbers while reinforcing my swingarm. 
I agree with the binding at the swingarm, but again what about every factory 3 wheeler? Am I wrong on thinking the bearings will "lift the bike" before they fail?(total of 1000 lb+)
Basically if the swingarm  binds because of flexing, if it don't flex are we then good to go?  
I am asking questions to poke holes in my theories, not yours.I am wrong a lot ,hahahaha  
you can see the springs I added for the "unsprung" weight. After the springs and mono shock she is SMOOTH.