Sonnax clinched-seam bushing GMFD-B-1 provides rebuilders with an upgrade to the OE butt-end style bushing found in GM 6T70, 6T75 and Ford 6F50, 6F55 converters. Made from aluminum bimetal alloy with steel backing for high load capacity, GMFD-B-1 has two I.D. grooves to enhance oil flow.