I got my alloy shafts from TRB machine last week and from the pictures you can tell the new shafts don't neck down from the spline diameter. Zerk fittings are easy to access thru an enlarged plug on the outside of knuckle. The "stock " rockwell joint is on the right next to a stock rockwell shaft that has a spl-90 series spicer u-joint that has double seals and grease fittings. The rockwell joints are wide open and always rusted. This might not be a big deal for those out west but in the southeast ,water and mud are always present. Steverockwell pics