smj999smj wrote:Unless I'm mistaken, I don't believe the hubs on the R50 do any locking or unlocking like the hubs on the earlier WD21's and the Hardbody trucks. The R50 has just a knuckle with races, tapered wheel bearings, seals, a flange plate, bearing lock nut and a snap ring. There is no spring, brake plate nor clutch. If you have a noise in a hub, I would suspect a bad wheel bearing. I would think the 4x4 system works similar to that of the R51 Pathfinder where the front driveshaft turns any time the front wheels turn and the drive engagement takes place inside the transfer case. That would make sense in that you can find a hub assembly on Rockauto; what you are likely looking at on the Nissan site is probably just the flange plate.