Yukon 1541H alloy 6 lug 30 spline rear axle for '63-'72 GM 12T. Yukon Gear and Axle offers an extensive line of general replacement and high performance axles for passenger car, truck and SUV applications. High quality alloys and the best in heat-treating technologies provide a strong axle for all uses. Yukon Gear & Axle offers an extensive line of general replacement and high-performance axles for passenger car, truck and SUV applications. High quality alloys and the latest in heat-treating technologies provide a stronger-than-stock axle for off-road, on the street, or at the track.