for GM 4L60E 4L65E 4L70E M30 Pinless Forward Accumulator Piston Kit 77987-01K
Fitment:
77987-01K pinless forward accumulator piston kit, compatible with GM 4L60-E (1993 - 2018), 4L65-E (2001 - 2018), 4L70-E (2001 - 2018) M30 automatic transmissions. Will not work or fit in 700R4 or 4L60. Replaceable part numbers: 352-5861, 77987-01K, 74741GAK, 7798701K, K61987L, S74741GAK
Features:
1) 77987-01K pinless forward accumulator piston kit is made of high quality aluminum alloy, steel and rubber material, which is strong and durable, light weight, rustproof and non-fading, improving the longer service life of the transmission
1) 77987-01K pinless forward accumulator piston kit is made of high quality aluminum alloy, steel and rubber material, which is strong and durable, light weight, rustproof and non-fading, improving the longer service life of the transmission
2) 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 are used to plug existing pin holes in the valve body
3) In the GM 4L60-E 4L65-E 4L70-E, plastic forward accumulator piston failure is often the cause of plastic wear or cracking. This causes fluid loss, which delays engagement, slipping, and burning of the clutch and/or belt. Repeated reciprocation of the accumulator piston will result in wear of the piston pin bore. Fluid is lost through the piston pin hole or crack, causing forward clutch slippage. This problem can be completely avoided with the metal 77987-01K pinless forward accumulator piston kit
Package included:
1*pinless forward accumulator piston, 2*seal ring, 2*steel ball 
