---
product_id: 305826983
title: "4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit"
brand: "sonnax"
price: "Bs.475"
currency: BOB
in_stock: true
reviews_count: 5
category: "Sonnax"
url: https://www.desertcart.bo/products/305826983-4l60-4l60e-4l65-e-and-4l70-e-pinless-accumulator-piston
store_origin: BO
region: Bolivia
---

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

**Brand:** sonnax
**Price:** Bs.475
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your transmission game—leak-free power, sealed tight!

## Quick Answers

- **What is this?** 4L60 4L60E 4L65-E & 4L70-E Pinless Accumulator Piston Kit by sonnax
- **How much does it cost?** Bs.475 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/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

- • **Dual Seal Security:** Stabilizes and completely seals the bore, ensuring peak performance
- • **Lightweight & Compact:** Only 50g with sleek dimensions for easy installation
- • **Trusted Sonnax Quality:** OEM-grade part designed for 4L60, 4L60E, 4L65-E & 4L70-E transmissions
- • **Precision Steel Ball Plugs:** Effectively blocks existing pin bores in case or cover
- • **Leakproof Pinless Innovation:** Eliminates pin bore leakage for unmatched reliability

## Overview

The Sonnax Pinless Accumulator Piston Kit is engineered for 4L60, 4L60E, 4L65-E, and 4L70-E transmissions, featuring a pinless design that eliminates pin bore leakage, dual seals for enhanced bore stability, and steel ball plugs to secure existing pin bores. Lightweight and precision-crafted, this kit ensures reliable, OEM-quality performance for professional-grade transmission maintenance.

## 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.

Review: funciona según lo esperado - mejoro la transmisión recomiendo su uso es fácil de instalar lo pude yo mismo y no soy mecánico
Review: Works great. - 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
- 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 |
|---------------|-------|
| Manufacturer | Sonnax |
| Brand | Sonnax |
| Package Dimensions | 21.01 x 12.7 x 2.79 cm; 50 g |
| Item model number | WO161131 |
| Manufacturer Part Number | 77998-03K |
| OEM Part Number | 62-77998-03K |
| Item Weight | 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

### ⭐⭐⭐⭐⭐ funciona según lo esperado
*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

### ⭐⭐⭐⭐⭐ Works great.
*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.

### ⭐⭐⭐⭐⭐ 1-2 rough shift, 2-3 sloppy FIXED
*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.

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**Shop now:** [https://www.desertcart.bo/products/305826983-4l60-4l60e-4l65-e-and-4l70-e-pinless-accumulator-piston](https://www.desertcart.bo/products/305826983-4l60-4l60e-4l65-e-and-4l70-e-pinless-accumulator-piston)

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-02-06*