Ten Factory D44 Rear 30 spline axles LJ-TJ Wrangler Rubicon- These are an excellent, durable option for anyone looking to upgrade their axles. These feature a heat treated 4140 chromoly steel matierial ensuring strength and durability. The bolt in is a performance upgrade. The chromoly significantly increases strength and durability. Kit includes: left and a right axle shaft, wheel studs, seals and axle bearings.