I just fixed an SVT with the same problem. Car still moved with some teeth missing but made a fairly loud noise and jerked when it got to the missing teeth section.

It now has a Torsen installed and will be my winter beater for a while.

1999 3.0L Cougar: 220fwhp and 200tq 2003 VW Passat W8 with 4 Motion AWD http://www.cardomain.com/ride/300644 PM for intrest in 3L SVT Contours, 3L swaps into your current car, Prepped 3L engines, or anything 3L related.