---
product_id: 500741082
title: "4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit"
brand: "sonnax"
price: "€ 55.43"
currency: EUR
in_stock: true
reviews_count: 5
category: "Sonnax"
url: https://www.desertcart.fi/products/500741082-4l60-4l60e-4l65-e-and-4l70-e-pinless-accumulator-piston
store_origin: FI
region: Finland
---

# Pinless design for zero leakage Precision steel balls for smooth operation Dual seals for ultimate bore stability 4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit

**Brand:** sonnax
**Price:** € 55.43
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift Smooth, Drive Confident: Upgrade Your Transmission Game

## Quick Answers

- **What is this?** 4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit by sonnax
- **How much does it cost?** € 55.43 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/500741082-4l60-4l60e-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

- • **Durable Dual-Seal System:** Viton D-Ring and PTFE seals maintain tight sealing after thousands of cycles
- • **DIY-Friendly Installation:** Easy to install with clear guides—upgrade your transmission like a pro
- • **Leak-Proof Pinless Innovation:** Eliminates pin bore leaks for unmatched transmission reliability
- • **Stabilized Piston Performance:** Extra length prevents piston cocking, ensuring consistent shifts
- • **Precision Steel Ball Components:** Engineered steel balls enhance smooth piston movement and longevity

## Overview

The Sonnax 4L60 series Pinless Accumulator Piston Kit features a cutting-edge pinless design that eliminates leakage risks and stabilizes piston movement with dual Viton and PTFE seals. Engineered for GM transmissions (4L60, 4L60E, 4L65E, 4L70E), this kit ensures smoother, more reliable gear shifts and long-lasting performance, backed by over 500 positive reviews and easy DIY installation.

## Description

sonnax 77998-03K Pinless 1-2 or 3-4 Accumulator Piston Kit Transmission - General Motors: 200-4R, 4L60, 4L60-E, 4L65-E, 4L70-E High Performance Transmission - General Motors: 200-4R, 4L60, 4L60-E, 4L65-E, 4L70-E

Review: mejoro la transmisión recomiendo su uso es fácil de instalar lo pude yo mismo y no soy mecánico
Review: Im not saying my shift is 100% like new but it was a noticable difference. 95% shifts real smooth vs before 1% of the time if i let off the gas it shifted smooth. Theres also a great video on youtube on how to install it. Only like 15 miles so far will update if anything changes.

## Features

- 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
- Pinless Accumulator Piston, Viton? D-Ring, PTFE Seal, Steel Balls (2)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BCN9Z5A |
| Brand | Sonnax |
| Customer Reviews | 4.7 4.7 out of 5 stars (516) |
| Date First Available | 7 Feb. 2013 |
| 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)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by N***O on 22 September 2024*

mejoro la transmisión recomiendo su uso es fácil de instalar lo pude yo mismo y no soy mecánico

### ⭐⭐⭐⭐⭐ Review
*by J***N on 28 December 2025*

Im not saying my shift is 100% like new but it was a noticable difference. 95% shifts real smooth vs before 1% of the time if i let off the gas it shifted smooth. Theres also a great video on youtube on how to install it. Only like 15 miles so far will update if anything changes.

### ⭐⭐⭐⭐⭐ Review
*by A***R on 16 August 2025*

Not sure how or why, but this fixed the 1-2 Rough shift and 2-3 weak/sloppy shift in my 2003 Sierra 1500 with the 4L60e. It drives like a new truck. It will take a decent amount of experience to DIY this. I’m no transmission builder, but if you got some buddies and a hoist, it’s a breeze. Do lots of research on youtube on how to do the job before attempting. The trans pan must be dropped to do the job. Great product.

## 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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**Shop now:** [https://www.desertcart.fi/products/500741082-4l60-4l60e-4l65-e-and-4l70-e-pinless-accumulator-piston](https://www.desertcart.fi/products/500741082-4l60-4l60e-4l65-e-and-4l70-e-pinless-accumulator-piston)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-02*