Description:

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, Steel balls plug existing pin bore in case or cover.. 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..