Yukon 1541H Alloy 6 Lug Rear Axle, 12 Bolt, 4wd, 70-78 Blazer. Axle length of 31-7/16 inches and 30 splines. Yukon 1541H alloy axles offer a strength increase over stock while retaining a low cost. Yukon 1541H alloy rear axles come with a one year warranty against manufacturing defects. This is a C-clip.