Wilwood’s 2.50” drop ProSpindle and disc brake upgrade kits improve the handling, styling and braking capacity on all 1973-1987 Chevy/GMC C10 pickups, as well as all 1963-1972 models that have been updated with the later model ball joints. A safer, sturdier and more lightweight alternative, ProSpindles feature forged aluminum bolt-on steering arms and forged aluminum knuckles with fortified caliper mounting bosses for the full range of Superlite and Aerolite disc brake kit options.