I've got that same problem on my 86 GL wagon. Just replaced the drivers side axle - the passenger was replaced about a year ago. The noise might have gotten a bit better, but it's definitely still there. The bearings are good, and freshly greased. I was thinking the brakes (they shudder a bit on braking indicating warped rotors, i guess), but before I thought about the brakes, alignment crossed my mind. My front tires are worn out, and I'm about to replace them. I'll have an alignment done at the same time, and let you know if the noise goes away.