Rebuilt they replace failed components,reman they normally replace all wear and tear components,GM certified all parts except the case and carries a warranty good at any GM dealer.As for does anyone rebuild any more,rarely.The cost of labor is high,you have the pullers and installers then you need a rebuilder which isn't cheap. American Driveline(aamco) opened a facility to rebuild and it's franchisees purchase from them.Hope that helps
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