Proud Veteran Owned Business Member!

Frequently Asked Questions

Transmission Lookup


Kit, Reamer, Accumulator Pin, 700-R4, 4L60, 4L60-E, 4L65-E, 4L70-E, GM (82-UP)

<< Previous in Accumulators,Servos/Components Next in Accumulators,Servos/Components >>
Oversized Accumulator Pin & Reamer Kit
Price: $87.99
Part Number: TAT-S74938XEK-TS
A common condition in 4L60-E transmissions is a burned forward clutch or delayed engagement. A worn forward accumulator piston pin bore is frequently the source of this condition. The aluminum piston continuously oscillates on a hardened steel pin, which can cause wear resulting in forward clutch oil exhausting. This oil loss reduces accumulator action and decreases the forward clutch apply pressure. The Sonnax replacement oversized accumulator pin 77754-01K eliminates this problem.

Features & Benefits

Oversized accumulator pin restores the proper fit between the piston bore and pin.
Pin is made from hardened steel and fits more securely in the valve body bore, preventing oil from exhausting through the valve body.
Allows the rebuilder to re-use the original piston while providing a more durable, less expensive solution.
Starter kit 77754-02K contains 10 pins plus one reamer.

Product Reviews

(0 Ratings, 0 Reviews)
Click Manufacture Category below for better navigation
WE HAVE HUNDREDS OF PARTS NOT LISTED!! If you cannot find the part you are looking for give us a call @ 1-877-406-0617 and we will be glad to help. Monday - Friday 8am - 5pm CST
Browse Categories
Shopping Cart
Your cart is empty.

Our Builders Recommend: