UMI Performance 70-81 GM F-Body Front A-arm Kit Delrin Bushings Adj Tall Ball JointsUMIs 2nd Generation F Body performance a arms are perfect for the F Body enthusiast seeking to improve the performance and blur the lines between race and street use. This kit features caster relocation of both the upper and lower ball joints to enhance steering feel and improve high speed stability. As designed, the caster potential is 8+ degrees. The spindle pin location remains unchanged so fender clearance is like stock. The adjustable upper a