I wouldn't be too happy FastCougar, if it were the LSD. Yeah, Quaife will replace it, but damn that is a [censored] install.
My bet is (an no offense, but I am gonna rant) that your piece of crap CenterForce clutch took a [censored] on you. Mine had 3k miles on it and I glazed it good and it never was the same. I upgraded to a SpecIII and had no drivability issues (I was ~295FWHP / ~270TQ). You do have to put up with some clutch chatter, but that wasn't too bad.
The CenterForce clutch for the Contour/Cougar is not much more than stock. It is not worth the price. Go stock or SPEC or whatever, just not CF.