I recently bought some plus 2 a arms and some g force hubs for the rear. After putting the hubs on i noticed alot of vibrating. i jacked the back in up and the tires were wobbling pretty bad, so i took just the tires off and watched the g force hubs bounce up and down. then took the hubs off and i could see mostly on the left side of the bike the axle was moving up and down but not so much on the right. then i tried puting the stock hubs on and tires and jacked it up and watched the tires spin it is still jumping but not so much. does that sound like bearings are a bent stock axle?

and also if i was to jack up my bike put it in first and let off the clutch, the chain seems to be slipping is that because the tires are not off the ground? thanks

if your bearings are going bad you will have play in your whole axle. have you ever wrecked or hit a tree bad enough to bend your axle

Check the lock nut and bearings on/in the carrier. For your chain slipping, change your sprockets! Make sure u change both sprockets and your chain at the same time. If your riding in sand go with a standard non o-ring chain.