Knocking Noise Coming From Rear

[jkotsa]

car 1996 r33 gtstHi guys this problem only started a few days ago when i noticed a sqeeky noise coming from the left rear hand wheel section. I ignored it untill the next day it was now making a soft thumping noise it sounded like the tyreswere worn and just yesterday whilst driving it started making a loud thumping noise whilst cruizing and taking offand slowing down the noise gets really bad. Around a month ago i was told i need new rear shock as they were leaking and a wheel alignment but hadent got around to doing it but i dont think that this could cause this problem. im thinking more the tailshaft but maybe DIFF :(any feedback would be greatly appreciated.regards Jim