Yukon 4340 Chrome Moly replacement rear axle for Dana 80, 37 spline. This is a cut to fit axle which fits 35.5" to 39.5" applications. Yukon 4340 Chrome Moly alloy axles offer a strength increase over stock while retaining a low cost. Yukon 4340 Chrome Moly alloy rear axles come with a limited lifetime warranty against manufacturing defects.