This kit for C2/C3 ('63-'82) Corvettes improves the yoke-shaft torsion capability by improving the spline to a more modern and stronger 31 tooth involute profile. The axle flange (spindle), is produced from 4340 aircraft alloy forging that utilizes a double heat-treat process and features shot peening for improved cycle life. The universal joint yoke replaces the two parts of the original design, eliminating the 4-bolt flange. The splined yoke is through hardened steel and features removable heat-treated billet caps that simplify the installation. The universal joint cap is attached with ARP fasteners and is drilled for safety wire locking. The axle-shaft features a 1”-20 thread that increases the assembled strength. The axle comes with installed 1/2"-20 x 3" ARP wheel studs that feature a nut-aligning quick start. 2" long studs are an option. They are installed with a threaded connection into the axle flange. There is a second pattern with 5/16"-18 threads that can be used to secure the brake disc. The kit comes with all the parts required for assembly including Timken® bearings and SKF-CR seals. Sold as a kit, for both sides. Installation - Service instructions can be found on Service Bulletin #0115.