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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. Alloy USA uses the latest cold rolled splining technology, to produce splines that are stronger than traditional cut splines. Alloy USA shafts are covered by an exclusive 10-year warranty! Rear axle shaft kits include everything you need for your installation: both passenger and drive side shafts, seals, bearings and wheel studs. Upgraded spline counts for Jeep applications: Dana 35 spline upgrades from 27 splines to 30 splines. Dana 44 spline upgrades from 30 splines to 33 and 35 splines.