For Sonnax Pinless Accumulator Piston Kit Forward, 1-2, & 3-4 4L60E 4L65E 4L70. For Sale - New and Used

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For Sonnax Pinless Accumulator Piston Kit Forward, 1-2, & 3-4 4L60E 4L65E 4L70.:
$31.21

4L60E 4L65E 4L70E Transmission Sonnax Pinless AccumulatorsForward, 1-2, and 3-4 Accumulator Piston Kit
Item specifics:
Condition: Brand New
Type: Pinless Accumulator Piston kit
Material: Aluminum
Fitment Type: Direct Replacement
Model: 4L60E, 4L65E, 4L70E
OE Part Number:77987-01K, (2) 77998-03K

Description:

Part No.77987-01K

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 cycles
Pinless design eliminates the possibility of pin leakage, and the additional length stabilizes the piston to prevent piston cocking
Includes steel balls for plugging existing pin bore in valve Seal
Steel balls (2)

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 cocking
Dual seals stabilize and completely seal the bore and provide a tight seal even after thousands of cycles
Steel balls plug existing pin bore in case or Accumulator Ball.312" dia.
Steel Ball.236" dia.

Note: In 200-4R applications, this kit can only be used in the 3-4 accumulator location.

Fitment:
Fit for 4L60E 4L65E 4L70E Transmission
Fit for 1993-2018 4L60E: 1-2 & 3-4 Accumulator Piston (. 310" Pin Diameter) (Pinless Design)
Fit for 1981-1990 TH200-4R: Only 3-4 Accumulator Piston (. 310" Pin Diameter) (Pinless Design)
Fit for 2001-2018 4L70E: 1-2 & 3-4 Accumulator Piston (. 310" Pin Diameter) (Pinless Design)
Fit for 2001-2018 4L65E: 1-2 & 3-4 Accumulator Piston (. 310" Pin Diameter) (Pinless Design)
Fit for 1982-1993 TH700-R4: 1-2 & 3-4 Accumulator Piston (. 310" Pin Diameter) (Pinless Design)

Note: Please check the part number before buying to make sure it fits your car

Warm Prompt：

Please BE AWARE that the vehicle compatibility list on may not be 100% accurate. Please Comfirm The Parts Number And Confirm This Item Fits Yours Before Purchasing.
Above listed items are a main reference, for detailed model, please use the year/make/model check finder and check the replace part numbers to confirm the compatibility before purchasing.
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