The switchover that is common is NOT to sealed bearings. It's a switch from ball bearings to roller bearings.
You need hubs from a 61-68 full size Chevy. Use the bearings and grease seals for the 61-68. It's a direct replacement for the hubs and bearings you now have. The bearings are much cheaper to buy, but last longer.
But you still have the original drum brakes with this deal.
The late models with sealed bearings include a spindle and hub as part of the service package. Cost is relatively astronomical and there's no direct way to do this on a 55-57. Probably no real performance benefit to you anyway.
I recently picked up a set of hubs from a '63 on eBay for $35.00. Surprisingly, the grease seals (from NAPA) were about $15.00 each, which was more than the bearings. The only associated parts you can use from your Tri-5 are the axle nuts. You'll need to use the washer and grease caps from the '60's hubs.
You're absolutely right, Tom. I just bought two new U-joints for my '57 from NAPA, and guess where they were made? China! I've always considered NAPA parts to overall be of above-average quality; hopefully these maintain NAPA's previous standards.
Maybe in ten years or so I'll trust the quality of Chinese metals, but not yet.
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