Nitro 1541H steel and 4340 alloy & chromium and molybdenum alloy axles commonly
known as "chromoly":
Our OE replacement axles are made of 1541H steel for a 25-35% increase in strength over their stock counterparts. Nitro 4340 chromoly axles are also heat treated but are designed with extra material for strength where it's needed. All of our axles are precision machined to OE specifications for excellent fitment.
1541H steel is a heat treated, carbon steel with .41% or less of other impurities. The heat treatments make the metal harder, with out making it brittle with a tensile strength of 181,000 psi. Up to 30% stronger than OE axles.
4340 cromoly steel, is a lower carbon steel with a minimum of 10% chromium by
weight. Known as a high strength, low carbon steel with a tensile strength of
228,000 psi opposed to OE 1040 steel with a tensile strength of 110,000 to
That means they take more punishment, to get you further down the trail or off
the trail entirely. That's Nitro Tough.
Ford 7.5", 83-92 Ranger 2WD/4WD, 28 Spline, 29-5/32", 5 Lug, LH Rear Axle Shaft
1983-1992 Ford Ranger 2wd or 4wd Left Hand / Driver Side
1984-1990 Ford Bronco II 2wd or 4wd Left Hand / Driver Side
1987-1996 Ford Aerostar Right Hand / Passenger Side