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. Product Features:Fits Dana Spicer 804340 Chromoly37 splineCut to length design fits 35.5-39.5 applications8 x 3.96 bolt pattern