Hi guys I've been having issues lately with a rumbling noise coming from the rear of the car. Rumbling noises are problamatic with the Astra j in the rear and I've been through a few threads and followed a few recommendations with limited success. The rumbling noise has worsened again in the last few weeks and is at its worst on undulations and uneven parts of the road. Not a peep out of it on smooth road surfaces. I've noticed tonight that the shocks are bouncing. That is to say when I press the suspension down it doesn't come straight back up and stop, but goes back down again about halfway. It looks as if the shock absorbers may be goosed. My question is regarding the replacing of the shocks in the rear. Is this an easy job and what is required for me to undertake such work.