Ks3879

I have a 2005 Subaru Outback. When I make sharp turns driving or in reverse, the car shakes. It reminds of trying to turn when you have 4wd activated..sort of...my friend changed the rear differential and transmission fluid. He found small metal shards in the former (not sure if that's related)...I did a little research and found that a cv joint that needs replaced could cause the shaking, especially if the boot that covers was damaged. The car did have a broken boot....any insight would be much appreciated! Thanks!