I replaced wheel bearings and seals on my Speedster when I changed the rotors to 5-stud Chevy and eliminated the adapter/spacers the PO installed. The IRS rears were easy as pie. The hardest part is putting the proper torque on the axle nut. I couldn't use my torque multiplier because of the non-stock axle bolts, so I had to make up a long brace to hold the hub steady against the floor and use my 3/4" drive torque wrench. The Idiot book recommends a 30,000 mile re-pack interval, so I've got a few years before I have to re-lube.