Drivetrain slack

Wuero370z

Hello I recently got a 2013 370z and I have an issue with a drivetrain noise/movement. I first got the notorious axle click that many of the 2013s have so I’ve already ordered all the parts to fix that. The kawi castle nut solution anyways. But I let the problem go on for sometime and to be honest I fee a huge click in my drive train now. I also get the parking brake and slip light on a lot of my accelerations. The car feels almost as if I’m learning to drive stick and letting the clutch out to fast. It just seems kind of jerky when I shift. And I’d say ah I’ts just me I’m shifting a little rough but I’ve driven the car smooth as can be before so I know soemthing is up. Is it just the a severe case of the axle but being loose or has anyone else had this problem? Thanks