the only thing was my chain snaped and i removed the swing arm to replace
my chain guides and after that it started with the swing arm to shake at full throttle only
then you must have left out a spacer or something in the swinger. if you put the bike on a milk crate or stand, and grab each side of the axle and shake what happens? does it wiggle.
if it wiggles you missed something putting it together or a bearing is bad, that is probably your problem. Is it the swingarm wiggling or the axle in the housing?