Well this seems to be an ongoing process and will probably end up making me replace everything! Just kidding, my current status for this problem is that I have already replaced the balljoint and bushes in the rear Aframe which has removed a lot of the backlash I was getting when changing gears. It also seems to have removed a little of the lurching when I slow then speed up again. A perfect example is when going over a speed bump it is real bad.
Anyway, continuing on, I have asked a lot of questions on forums for advice on this problem and it seems to be leading me to the next fix which will be the rear trailing arms. Supposedly, when these are worn it will allow the diff to rotate in the direction of the wear which will give a sensation of lurching. Well this sounds like a perfectly valid explanation so this is where I might go next. However, they do look new but how would I know 😉
I will keep you appraised of my progress!