Sonnax 77998-03K Transmission Kit, 1-2 or 3-4 Accumulator Piston (.310" Pin

Brand: Sonnax Other Part Number: S74927K Type: Piston Manufacturer Warranty: Yes Items Included: Pinless Accumulator Piston, seals, two steel balls Manufacturer Part Number: 77998-03K Material: Aluminum Universal Fitment: Yes Vintage Part: No Performance Part: Yes 200-4R, 4L60, 4L60-E, 4L65-E, 4L70-E Pinless Accumulator Piston KitPart No. 77998-03K This listing is for (1) Pinless Accumulator Piston In 200-4R applications, this kit can only be used in the 3-4 accumulator location. 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