Hi guys...having a real problem with my 2006 Patrol Ute....would appreciate some real advise before going to a mechanic, In 2 wheel drive the ute steer's fine, turns fine, breaks fine, but when 4 wheel drive is selected, while straight ahead in fine...then as you start to turn into full lock....it feels as if the vehicle is pulling up and shudders...the back wheels try to drive the car forward in a straight line to the point where they start to loose traction...even on bitumen....any ideas