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Kit, Pinless Accumulator Piston, 1-2 or 3-4, D-Ring, Seal, 2 Balls, 2004R, 700R4, 4L60, 4L60-E, 4L65-E, 4L70-E, GM (82-UP)

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Pinless 1-2 or 3-4 Accumulator Piston & Balls
Pinless 1-2 or 3-4 Accumulator Piston & BallsKit Pinless Acc Piston 2004R, 700R4, 4L60, 4L60-E, 4L65-E, 4L70-EKit Pinless Acc Piston 2004R, 700R4, 4L60, 4L60-E, 4L65-E, 4L70-ESonnax 77998-03k
Price: $22.18
Part Number: TAT-77998-03K-SX
In 4L60 & 4L60-E units it is common to have poor shift quality, burned 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. Sonnax now offers three versions of a dual-seal, pinless accumulator piston kit, 77998-02K, 77998-03K and 77998-04K, to prevent the above conditions.

The dual seals stabilize and completely seal the bore and provide 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. This pinless accumulator piston kit does not work with OEM two accumulator spring applications. The stock accumulator piston can develop a large pressure leak at the pin area over a period of 50 to 100 thousand miles. (takes 2)

Features & Benefits

Dual seals stabilize and completely seal the bore and provide a tight seal even after thousands of cycles.
Pinless design eliminates the possibility of pin leakage and the additional length stabilizes the piston to prevent piston cocking.
Steel balls included for plugging existing pin bore in case or cover.


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