4l80e Updated Direct Clutch Piston Kit on 2040-parts.com

BOTH THE EARLY CAST ALUMINUM  AND LATE MOLDED RUBBER VERSIONS OF THE 4L80E DIRECT CLUTCH PISTON FALL SHORT IN PERFORMANCE APPLICATIONS. THE PISTONS LACK POSITIVE SEATING FOR THE DIRECT CLUTCH RELEASE SPRINGS AND HAVE A NARROW WORK SURFACE APPLYING THE CLUTCH PACK. BOTH PISTONS ARE SHOWN IN THE PHOTO. THIS KIT INCLUDES A MODIFIED OEM TH400 DIRECT CLUTCH PISTON (WITHOUT CHECKBALL) WHICH PERMITS THE INSTALLATION OF SIX STANDARD THICKNESS .090"DIRECT CLUTCH PLATES AND SIX STANDARD THICKNESS .080" DIRECT STEEL PLATES IN THE OEM 4L80E DIRECT CLUTCH HOUSING. THIS IN ITSELF INCREASES THE DIRECT CLUTCH CAPACITY AS ALL OEM 4L80E TRANSMISSIONS ARE FIT WITH FIVE DIRECT CLUTCH PLATES.  THIS PISTON FEATURES A WIDE WORK SURFACE IMPROVING DISTRIBUTION OF APPLY FORCE TRANSMITTED TO THE CLUTCH PACK.THE KIT ALSO INCLUDES A SET OF 16 HIGH RATE DIRECT CLUTCH APPLY/RELEASE SPRINGS WHICH ALLOW MAXIMUM PRESSURE VALUES IN THE DIRECT CLUTCH APPLY CIRCUIT TO BE OBTAINED BEFORE THE CLUTCH PACK APPLIES, VASTLY IMPROVING SHIFT QUALITY AND CLUTCH PACK CAPACITY. KIT ALSO INCLUDES OEM TH400 STAMPED STEEL APPLY/RELEASE SPRING RETAINER.EVERYTHING NEEDED TO REPLACE THE OEM PISTON AND RETURN SPRING ASSEMBLY IS INCLUDED. KIT IS SHOWN IN THE PHOTO.