my 300tdi will not move forward or backward.i can put it in gear while the engine is running without using the clutch there is no grinding noise or any other its not jumping out of gear i can select all 5 gears and reverse diff lock not makin any diffrence diff lock light on dash is lighting any1 here had this or got any ideas is there any checks i should do i have checked hydraulics down to slave cylinder can see its workin any help appreciated cheers chris