High tensile strength 4340 Chromoly is heat-treated, tempered and induction hardened to produce these heavy-duty axles that are up to 40% stronger than stock 1040 axles. Front axle shaft kits include everything you need to complete the job both passenger and drive side inner and outer axle shafts, seals, U-joints and clips. Chevy K20 / K20 Suburban 1973, Axle Shaft, 17.67 in, Inner, Passenger Side (10660) by Alloy usa. Upgrade your axle shafts for less than the cost of original replacements. The