Hi Performance Blue Input Drum Bonded Piston Kit 1997-Up 4L60E 4L65E 4L70E CHEVY, GMC, BUICK, PONTIAC, CADILLAC, OLDSMOBILE Hi-Per Blue pistons are re-engineered OE design that is manufactured with upgraded blue AEM (ethylene acrylic elastomer) for superior thermal and chemical resistance that fit & perform better. Meets or exceeds OEM specifications Better temperature range Higher tear strength Better bonding characteristics SAP-designed for better seal support FITMENT: 1997 - 2014 4L60E 2001 - 2007 4L65E 2002 - 2006 4L60E-HD LISTING CONTENT: 3/4 Piston Forward Piston Overrun Piston