Sonnax Pinless Accumulator Piston Kit Forward, 1-2, & 3-4 4L60E 4L65E 4L70
Specifications
| Return Shipping Will Be Paid By | Buyer |
| Returns Accepted | Returns Accepted |
| Item Must Be Returned Within | 30 Days |
| Refund Will Be Given As | Money Back |
| Brand | Sonnax |
| Interchange Part Number | S74927BK, S74927K |
| Universal Fitment | Yes |
| Performance Part | Yes |
Sonnax 3-Piece Pinless Accumulator Piston Set Forward, 1-2, and 3-4 Accumulator Pistons Fits 1993-On 4L60E 4L65E 4L70E Contains: Part No. 77987-01K (1Pc.) Dual Seal design In 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. Sonnax pinless forward accumulator piston kit 77987-01K eliminates these problems.Dual 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 cockingIncludes steel balls for plugging existing pin bore in valve bodyContentsPistonD-RingPTFE SealSteel balls (2)SpecsMaterial: Aluminum Part No. 77998-03K (2Pc.) In listed GM units it is common to have poor shift quality, burnt bands or clutches due to accumulator piston wear. Repeated reciprocation of the accumulator piston causes wear at the piston pin bore interface. 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, Sonnax offers pinless accumulator piston kit 77998-03K.Pinless design eliminates the possibility of pin bore leakage and the additional length stabilizes the piston to prevent piston cockingDual seals stabilize and completely seal the bore and provide a tight seal even after thousands of cyclesSteel balls plug existing pin bore in case or coverContentsD-Ring Viton®Pinless Accumulator Piston AluminumSeal PTFESteel Ball .312" dia.Steel Ball .236" dia.This Improved design is a must for performance vehicles. READY TO INSTALL Easy Upgrade for your Performance Rebuild ______________________________________________________________ Save a bundle here over the cost from a dealership. Buy with confidence * Check out our feedbackAll of our items listed are in stock and ready to ship We Quick-Ship Every Day ! .