I did a donut in my car once...and had a terrible squeeking sound in my front end for 6 months...I think it was my ball joint which I eventually replaced anyways, either that or the white lithium greese I used on everything stopped whatever it was.
Fox mustangs need crazy money in the suspension...like 100% everthing replaced; even my $1400 suspension upgrade isn't enough to handle that kind of abuse.