It's easy if its a non crush sleeve. Order a new seal and pinion nuts get extra. Never reuse a pinion nut! Remove DS, pinion nut, washer, pinion. Pry out the old seal install the new seal lube the seal reintall pinion, washer, new nut and torque to about 175ftlb This is for a d44! Check what rear you have and torque specs! This is general info on how I did mine!