Inconsistent shifts, high shift adapt numbers and burned clutches in a GM 4T65-E can all be traced back to worn accumulator pistons. Pin bore wear allows clutch apply pressure to exhaust into accumulator circuits and decrease clutch apply pressure. Sonnax oversized accumulator pin and reamer kit 84754-52K allows easy repairs of worn pistons and eliminates the need to purchase new pistons for different applications.

• Oversized accumulator pin restores the proper fit between the piston bore and pin
• Pin is made from hardened steel and fits more securely in the valve body bore, preventing oil from exhausting through the valve body
• Allows the rebuilder to re-use the original piston while providing a more durable, less expensive solution