June 16, 2014 by Carter @ Zone Offroad 10 Chevrolet/GMC PR, Chevy/GMC2007-2013 Chevy/GMC 1500 Heavy Duty Upper Control Arm Kits | NPA #73 The latest product to hit the market from Zone Offroad Products are new upper control arms for later model Chevy Silverado and GMC Sierra 1500 2WD/4WD trucks. 1/2 ton a-arms aarms Chevy GMC silver ado Suspension UCA upper control arm 1/1