4L60 4L60E 4L65-E and 4L70-E Pinless Accumulator Piston Kit with Seals for Sonnax, 1-2 & 3-4

Description:Manufacturer Part Numbers: 77987-01K, (2) 77998-03KInterchange Part Numbers: S74927BK, S74927KDual seals stabilize and completely seal the bore, providing a tight seal even after thousands of cyclesPinless design eliminates the possibility of pin leakage, and the additional length stabilizes the piston to prevent piston cockingPart Number 77987-01KMaterial: AluminumDual Seal designfor GM 4L60-E, 4L65-E and 4L70-E units it is common for the plastic forward accumulator piston to wear or crackThis causes a loss of fluid, resulting in delayed engagement, slips, burnt clutches and/or bandsRepeated reciprocation of the accumulator piston causes the piston pin bore to wear, while fluid loss through the piston pin bore or cracks causes forward clutch to slipThe Pinless forward accumulator piston kit 77987-01K eliminates these problemsPackage Includes:PistonD-RingPTFE Seal2x Steel balls for plugging existing pin bore in valve bodyPart Number 77998-03K (2)for GM units it is common to have poor shift quality, burnt bands or clutches due to accumulator piston wearRepeated reciprocation of the accumulator piston causes wear at the piston pin bore interfaceAfter this wear reaches a critical point, fluid loss through the piston pin bore cannot be compensated due to lack of pump volumeIn addition, the piston can get cocked and gall the accumulator bore due to the pin bore wear or the spring bottoming outTo prevent these conditions in the 1-2 or 3-4 accumulator boresSteel balls plug existing pin bore in case or coverPackage Includes:D-Ring VitonPinless Accumulator Piston AluminumSeal PTFESteel Ball Size .312"Steel Ball Size .236"Note: In 200-4R applications, this kit can only be used in the 3-4 accumulator location

• ➥➤ Brand-New and High Performance 1-2, and 3-4 Accumulator Piston Kit. Manufacturer Part Numbers: 77987-01K, (2) 77998-03K; Interchange Part Numbers: S74927BK, S74927K.
• ➥➤ 77987-01K - for GM 4L60-E, 4L65-E and 4L70-E units it is common for the plastic forward accumulator piston to wear or crack. This causes a loss of fluid, resulting in delayed engagement, slips, burnt clutches and/or bands. Repeated reciprocation of the accumulator piston causes the piston pin bore to wear, while fluid loss through the piston pin bore or cracks causes forward clutch to slip. The Pinless forward accumulator piston kit 77987-01K can eliminates these problems.
• ➥➤ 77998-03K (2Pcs) - for GM units it is common to have poor shift quality, burnt bands or clutches due to accumulator piston wear,After this wear reaches a critical point, fluid loss through the piston pin bore cannot be compensated due to lack of pump volume. In addition, the piston can get cocked and gall the accumulator bore due to the pin bore wear or the spring bottoming out,to prevent these conditions in the 1-2 or 3-4 accumulator bores
• ➥➤ Dual Seal design - Dual seals stabilize and completely seal the bore, providing a tight seal even after thousands of cycles. The Pinless design eliminates the possibility of pin leakage, and the additional length stabilizes the piston to prevent piston cocking.
• ➥➤ Package Includes: 3Pcs Pinless Accumulators Kits with Seals.