A couple of other things I'll mention is that the axle shafts in the 12 bolt rear ends are known for wearing and that plus the looser tolerance in the bearings will add up to more radial play. I realize everyone would prefer something like .001, but I don't believe you can get that without also replacing axles and I don't think .008" is enough to worry about...that being the thickness of two sheets of common copy paper. You'll also have expansion with heat from operation, so usually it all balances. If you were using your Suburban to travel the USA all the time I might be inclined to get new axle shafts but if you're just driving around NM, I think you'll be okay. Once upon a time there were bearings that were made so that they'd run on a different part of the axle (can't recall what they were called) but friends said they thought they were more sizzle than steak.

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end