Western Chassis 13163 - 1963-70 Chevy and GMC truck 2.5" drop spindles lower the front of your vehicle without affecting ride quality or suspension geometry and bolt directly to the original ball joints. Made in the USA, these are the first drop spindles to hit the industry back in 1981. Over the years we have continuously improved the design to what it is today. These spindles are far superior to any modular spindle on the market. Be cautious of modular spindle failures as sonic testing proves Western Chassis' spindle is far superior and no porosity.