If it is a ball joint, it is much easier to change the whole A-arm. I did both A-arms in less than 2 hours in my driveway with hand tools. check
www.rockauto.com for best prices A Moog or Raybestos ball joint is $43. A raybestos a-arm is $58.
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03 GT, STB, GM HD sway bars, 35% tint, GE893(37watt)fogs, Flowtech Terminators, 180 T-stat, ZZP DP & PCM, Ceramic PLOG & Crossover, 18" glasspack, 2007 17" Mustang Bullits 235/55/17 Pirelli PZero Nero, 12" R1 D\S rotors, gutted air box, GTP radiator