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 Inner Driver Side 10661 by Alloy USA. Upgrade your axle shafts for less than the cost of original replacements. These Alloy USA performance axles shafts are made from heavy-duty steel that is heat treated and induction hardened to be 35% stronger than stock.
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