---
product_id: 305826983
title: "4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit"
brand: "sonnax"
price: "€ 39.35"
currency: EUR
in_stock: true
category: "Sonnax"
url: https://www.desertcart.be/products/305826983-4l60-4l60e-4l65-e-and-4l70-e-pinless-accumulator-piston
store_origin: BE
region: Belgium
---

# Pinless design eliminates leakage Steel balls plug pin bore securely Dual seals for airtight bore stability 4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit

**Brand:** sonnax
**Price:** € 39.35
**Availability:** ✅ In Stock

## Summary

> ⚙️ Upgrade your shift game with leak-proof precision!

## Quick Answers

- **What is this?** 4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit by sonnax
- **How much does it cost?** € 39.35 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/305826983-4l60-4l60e-4l65-e-and-4l70-e-pinless-accumulator-piston)

## Best For

- sonnax enthusiasts

## Why This Product

- Trusted sonnax brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durability Boost:** Steel ball plugs prevent wear-related failures, extending transmission life
- • **Easy OEM Upgrade:** Direct fit for GM 4L60-E, 4L65-E & 4L70-E units—upgrade with confidence
- • **Leak-Free Performance:** Pinless design eradicates pin bore leaks for flawless fluid control
- • **Enhanced Shift Quality:** Dual seals stabilize piston, delivering smooth, precise gear shifts
- • **Burnt Clutch Prevention:** Eliminates piston wear causes, protecting clutches and bands from damage

## Overview

The Sonnax 4L60/4L60E/4L65-E & 4L70-E Pinless Accumulator Piston Kit features a patented pinless design with dual seals and steel ball plugs to eliminate pin bore leakage and piston wear. This kit improves shift quality, prevents burnt clutches and bands, and extends transmission life by stabilizing the piston and sealing the bore. Compatible with GM 4L60-E series transmissions, it’s a reliable OEM upgrade trusted by professionals.

## Description

Complaints: Burnt clutches & bands and poor shift quality. Cause: Wear at the piston pin bore due to repeated reciprocation. Correction: The Sonnax patented pinless design with dual seals stabilizes the piston in the bore and provides improved sealing characteristics. Use of the Sonnax part eliminates the need for the pins. In GM 4L60-E, 4L65-E and 4L70-E 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.

## Features

- Pinless design eliminates the possibility of pin bore leakage
- Dual seals stabilize and completely seal the bore and provide a tight seal
- Steel balls plug existing pin bore in case or cover

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BCN9Z5A |
| Brand | Sonnax |
| Customer Reviews | 4.7 4.7 out of 5 stars (521) |
| Date First Available | 18 March 2021 |
| Item Weight | 50 g |
| Item model number | WO161131 |
| Manufacturer | Sonnax |
| Manufacturer Part Number | 77998-03K |
| OEM Part Number | 62-77998-03K |
| Package Dimensions | 21.01 x 12.7 x 2.79 cm; 50 g |

## Images

![4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit - Image 1](https://m.media-amazon.com/images/I/41Z9r7cWDeL.jpg)

## Frequently Bought Together

- Sonnax 4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit
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- ACDelco GM Original Equipment 24220146 Automatic Transmission 1-2 Yellow Accumulator Piston Inner Spring

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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-07-04*