New, you're prob best off buying a new pair of Mosers, esp if your Bird's rear is a factory HD Safe-T-Track. The HD Safe-T-Track 8.2 rears, besides the nodular center housing, had HD axles & finding a pair of unchewed HD Safe-T-Track axles is next to impossible.
Good used, even the std duty Pontiac 8.2 sealed bearing axles are getting very hard to to find that aren't chewed up under the axle bearings. Every year I sell a half dozen or so of good used sealed bearing Pontiac 9.2 axles with new bearing pressed on. Usually intall new studs too. Unless the old sealed bearing is pressed off, very hard to tell if the sealed axle bearing 8.2 axle is any good. If chewed, I pitch 'em.
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