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The Yukon GM 8.5-inch 30-spline 4340 front axle kit pairs chromoly inner and outer axles with Yukon Super Joints and 1310/760X u-joints for a heavy-duty replacement. Built from 4340 chromoly and processed with cold-roll-formed splines and advanced heat treating, the kit fits 1979–1987 GM half-ton front applications using the 8.5-inch differential and provides a direct, strength-focused upgrade.
Yukon Gear GM 8.5in 30Spline 4340 Front Axle Kit / w/ Super-Joint
