8 3/4 hard to rotate wheels

There has to be an axle adjuster on one side for things to work right with factory type bearings. It should be on the right side but as was said "could" be on either as long as it's there. You may have issues with how the bearings were pressed on. The assembly should be the flange, then bearing, then lock ring on both sides, with the RH axle having the adjuster on it. If you have no adjuster, you have to either replace with Green bearings (I get mine from Dr. Diff) or get an adjuster and install it on the RH axle.