The 993 C4 and others with LSD sometimes show signs of directional
instability at higher speeds (80+). This is probably due to deterioration of
the LSD which is made from some form of fibre material.
If you really want to know jack up car rear end both wheels off the floor and
turn a wheel with the car out of gear, the wheel you turn clockwise should move
with the opposite moving in the same direction with out play or slap. If it
moves in the other direction or doesn't move its f*cked only on c4 993 or c2
with a LSD , standard on all c4. The fibre breaks down and contaminates the
oil... Talk to Tech 9 for a cure. Barry S. - 25th May,
2001