[mr bruce]

The upper spindle bracket puts the upper ball joint boss "in front" of the lower ball joint boss, when looking at the spindle from the spindle pin side.(try to run a straight steel rod thu both bosses, you'll see what I mean) Do to this you have to dial in mucho caster which thows the bump steer into progressive mode when you turn the wheel,do to the steering arm being on such an angle .This may explain the twichy steering felt in some of these cars, could also contribute to qwik loss of controll some have been experiencing.A fast fix may be the Mustang 11 spindle, and dropping the inner pivot of the upper control arm to get the roll centre back where it should be.