not being familiar with your rear axle, but sounds like perhaps something is missing. how did the nut tighten up on the pinion as it has to bottom up against something.. there should be a shoulder or whatever for the yoke tightens up against. usually a bearing and there may be an oil slinger or whatever (missing) between the brg and the yoke. the splines where the yoke goes over the pinion are fairly snug and not sloppy
ron
