Upgrade your factory-2.5 Ton Rockwell rear axle shaft with this 300M replacement. Manufactured from aircraft quality steel and black oxide coated. Provide more than twice the strength of OEM shafts, and are backed by our "No Questions Asked Limited Lifetime Warranty". Shaft Sold Individually.- Can be used with the OEM front drive flanges, or with our kit: RCK-SLUG-16T