The 4L60/65E has five sets of clutch packs. Top left: Forward clutch set of Kolene steel. Top right: Reverse gear drum made of a special steel that allows the plates to cool down. Bottom left: The 3-4 gear clutch pack. To increase the drum capacity, Monster upgrades the assembly with two additional clutches (eight versus six). Bottom right: The reverse gear clutch pack is also made of Kolene steel and includes an Alto race clutch. Bottom: The overrun clutch pack. Two smaller items are the 29-element forward sprag (copper colored) and the low/reverse heavy-duty sprag with a hardened steel inner race (the black ring inside the sprag).