hi guys. have just experienced a bit of a problem on my 04ba turbo ute. when I bought it there was always a slight knock when ever I turned left. now when I start her up and go about 50metres till my first left the ute actually pulls up and stops. when you try and accel it starts knocking at the left rear. the motor sometimes revs up and down like its going to stall. I put it in neutral for ten seconds then it clears and lets me drive and then goes fine. its just started a few days ago. is it my diff? any help would be great