either push with 20 tonne press on edges of bush, has to be exact size, and not too big, or hacksaw two cuts sideways through the tubes and rubber together,then hammer out, very tough, some people burn them out, tons of poisonous smoke! be careful. good luck
before you start taking gearboxes out, try tightening up the special round castlated nut on the back of the main shaft, under the rectangular cover, also seen through PTO hole, this can sometimes help this problem, good luck
did you know you can drastically improve the turning circle of your late disco2,if you fit early disco 2 lockstops,you must have 16inch wheels,it only takes 5 mins with a 17mm socket