Alloy USA uses high strength 4140 Chromoly in all its Jeep axles. Our axles are heat-treated twice and induction hardened to produce these heavy-duty axles that are up to 35% stronger than stock 1040 axles. Alloy USA uses the latest cold spline rolling technology to produce splines that are stronger than traditional cut splines. This 1-piece chromoly rear axle shaft conversion kit from Alloy USA fits 76-81 Jeep CJ5 76-81 CJ7 and 1981 CJ8 with an AMC 20 rear axle.
