Sonnax flanged impeller hub GM-90-97G replaces worn or damaged impeller hubs in late-style GM 6T40/6T45, 236mm converters incorporating start/stop technology. Used in conjunction with Sonnax bushing GM-B-8, GM-90-97G has a large reinforced flange with a piloting diameter for accurate alignment and superior weld characteristics. The large flange also provides a substantial backup surface for impeller-side thrust bearing GM-N-24.