JERKY AND CRUNCHING NOISE FROM DRIVE TRAIN

1998 SUBARU 140000 MILES 2.5 AUTOMATIC HAS A JEKRY/CRUNCHING/ POPPING NOISE. (SORRY I CANT THINK OF A BETTER DESCRIPTION ) THIS OCCURS ONLY WHEN THE VEHICLE IS MOVING SLOWING AND IN A TURN IN EITHER DIRECTION SUCH AS AT AN INTERSECTION AND GIVING IT SOME GAS TO TURN RIGHT OR LEFT. ONCE AT SPEED OR DRIVING STRAIGHT ALL IS WELL. IN ADDITION TO THIS THERE IS ALSO SOME SHAKE AND VIBRATION THAT SEEMS TO OCCUR ONLY WHEN THE VEHICLE IS PULLING HARDER SUCH AS CLIMBING A HILL BUT DOES NOT SEEM TO BE THERE ALL THE TIME. I SEE THIS AS A SEPERATE PROBLEM BUT INCLUDE IT IN CASE SOMEONE ELSE THINKS IT RELEVANT. ALL THE DRIVE SHAFTS SEEM OK EXCEPT FOR ONE HAS A SPLIT BOOT.