Jon G - I think your looking for "Axle Saver" bearings. Evidently they can still be found for Chevy 10 and 12 Bolt rear axles, but not sure if these will also work with truck axles???
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)