Rear Subframe Bushings (diff Housing)

[SC300Drifter]

I believe the bushings holding my rear-subframe (houses my differential) are gone. When I shift to 2 and even sometimes 3rd I hear a loud clunk come from the rear of my car, when the clutch pedal is released. It is getting to the point that when I Grab 2nd my in-dash brake light comes on which leads me to believe that my E-brake cable is being stretched just enough to send a signal. When the car is sitting on level ground and I violently shake the car from sided to side in the back I can feel slight play ( remember I said violently) and no it is not the wheel bearings. Has anyone else experienced this? If so what was the cost to replace these or did you do it yourself?

[SC300Drifter]

I forgot to mention this car has been drifted on a regular basis, so I believe this is what is causing my problems.

Thanks

Derek