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If there is 1/8" of slop, new bearings alone probably won't correct the situation. I removed a 2 to 5 thou of shims to tighten visuably noticable vertical play in the pinion.
Unless your pinion bearings are damaged, is there any reason that you can't simply remove shims to restore the preload? You wouldn't replace loose wheel bearings if you could simply tighten them up, would you?