High Quality: Made from enhanced materials for wear resistance, high temperature resistance, and long service life. The pinless design eliminates the possibility of pin leakage. Precision steel balls can be used to seal existing pin holes in the housing or cover for precise sealing. Replacement with this piston kit improves gear shifting performance and extends the life of the band and clutch, delivering long-term stable and reliable operation. Fitment: • 1993–2018 GM 4L60E: 1–2 & 3–4 Accumulator Piston (0.310" pin diameter, pinless design) • 1981–1990 GM TH200-4R: 3–4 Accumulator Piston (0.310" pin diameter, pinless design) • 2001–2018 GM 4L70E: 1–2 & 3–4 Accumulator Piston (0.310" pin diameter, pinless design) • 2001–2018 GM 4L65E: 1–2 & 3–4 Accumulator Piston (0.310" pin diameter, pinless design) • 1982–1993 GM TH700-R4: 1–2 & 3–4 Accumulator Piston (0.310" pin diameter, pinless design) Part Numbers: 77998-03K, 62-77998-03K, 342-5806, 74927K, K61985, K61985L, S74927K Condition: New Manufacturer Part Number: 77987-01K, (2) 77998-03K Interchange Part Numbers: S74927BK, S74927K Compatible Models: 4L60E, 4L65E, 4L70E Type: Pinless Accumulator Fitment Type: Direct Replacement Color: Silver Material: Aluminum Package Includes: • 3 × Piston • 6 × PTFE Seal • 6 × Steel Ball Note: This listing includes only the items listed above. Other accessories are not included. Color appearance may vary slightly due to lighting and screen settings. Dimensions are subject to a tolerance of ±1–3 cm.