Good Mechanic Needed

I have a '92 Pearl white SVX and am in the inner part of Sydney. I have a noise and shudder in the front with hard turning and particular turning. As expected I have had all answers and no success. CV's beraings etc have been looked at. It began when I had an oil leak from the valve covers and oil got onto the front end on both sides. The latest suggestion is the transfer case and it will get better. It is not bgetting better. Any suggestions
Brett