GM Heavy Duty 4L60E 4L65E Input Drum 300mm with Sonnax Sleeve and Pistons
4L60E 300MM Input Drum- WITH PISTONS INSTALLED and NEW SONNAX REINFORCEMENT SLEEVE PRESSED ON THE INPUT DRUM IS A WEAK LINK IN ALL 700/4L60 TRANSMISSIONS AND WE RECOMMEND INSTALLING THIS SLEEVE FOR ANY APPLICATIONS OVER 300HP!!