---
product_id: 374902765
title: "Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC 2 GALLONS and ONE Allison 29539579 Filter ONLY by DOXA Worldwide"
brand: "stone river products"
price: "2062 Lei"
currency: RON
in_stock: true
reviews_count: 8
category: "Stone River Products"
url: https://www.desertcart.ro/products/374902765-stone-river-products-castrol-transynd-668-allison-2021-updated-spec
store_origin: RO
region: Romania
---

# Fits Allison 1000/2000/2400 series Extended anti-shudder & clutch durability Made in USA quality Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC 2 GALLONS and ONE Allison 29539579 Filter ONLY by DOXA Worldwide

**Brand:** stone river products
**Price:** 2062 Lei
**Availability:** ✅ In Stock

## Summary

> 🛠️ Keep your Allison transmission running smoother, longer — because your ride deserves the best.

## Quick Answers

- **What is this?** Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC 2 GALLONS and ONE Allison 29539579 Filter ONLY by DOXA Worldwide by stone river products
- **How much does it cost?** 2062 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/374902765-stone-river-products-castrol-transynd-668-allison-2021-updated-spec)

## Best For

- stone river products enthusiasts

## Why This Product

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

## Key Features

- • **OEM-Approved TES 668 Spec:** Guaranteed compatibility and superior protection for 2000-up diesel applications.
- • **Extended Service Intervals:** Outstanding thermal stability reduces oil thickening and extends drain intervals.
- • **Optimized Friction Control:** Smooth gear shifts and reduced transmission wear under all conditions.
- • **Premium Full-Synthetic Formula:** Engineered for peak Allison transmission performance and longevity.
- • **Genuine Allison Spin-On Filter Included:** Trusted filtration that maximizes transmission health and reliability.

## Overview

This Stone River Products kit includes 2 gallons of Castrol TranSynd TES 668 full-synthetic automatic transmission fluid and one genuine Allison 29539579 spin-on filter. Made in the USA and designed specifically for Allison 1000, 2000, and 2400 series transmissions, it delivers superior oxidative stability, anti-wear protection, and extended clutch and anti-shudder durability. Ideal for 2000-up diesel vehicles, this OEM-engineered fluid and filter combo ensures optimal transmission performance, longer service intervals, and enhanced gear protection.

## Description

ALLISON 1000 Chevy GMC Duramax Diesel Transynd TES 668 Fluid Transmission Premium Service Kit Fits 2000-up Diesel Applications OEM engineered fluid and spin-on oil filter to service your hard working investments! Castrol TranSynd 668 Fluid Castrol TranSynd 668 is a premium, full-synthetic automatic transmission fluid specifically formulated for Allison Transmission on-highway automatic transmissions. TranSynd 668 provides oxidative stability, anti-wear performance, and friction durability, as well as TES 668 specification differentiators such as extended anti-shudder durability and extended clutch friction durability. This fluid features an Allison TES 668 approval. The TES 668 spec is fully backwardscompatible for TES 295 applications, but is not backwards compatible for TES 468 applications (Hybrid Buses). Advantages · Delivers improved gear protection. · Delivers extended anti-shudder durability. · Delivers extended clutch-friction durability. · Excellent corrosion and foaming resistance. · Excellent thermal and oxidative stability that helps to prevent deposits and oil thickening. · Excellent transmission cleanliness under all conditions permits extended oil-drain intervals and decreased servicing. · Excellent temperature reduction through reduced friction leads to longer oil and component life. · Outstanding cold-flow properties enables faster oil flow to all critical components particularly during cold starts. · Optimized frictional characteristics gives smoother gear changing at all ambient temperatures and load conditions. · Excellent shear stability properties help to retain full transmission performance over entire oil-drain interval.

Review: Trusted - Works great
Review: 2002 duramax - Shipment arrived very quickly no leaks on container

## Features

- Made in the USA
- Fits Allison 1000, 2000 and 2400 series transmissions
- Castrol TranSynd TES 668 is a premium, full-synthetic automatic transmission fluid specifically formulated for Allison Transmission on-highway automatic transmissions.
- TranSynd 668 provides oxidative stability, anti-wear performance, and friction durability, as well as TES 668 specification differentiators such as extended anti-shudder durability and extended clutch friction durability.
- The Allison genuine spin on filter is one of the most widely used and recommended oil filters for the Allison 1000/2000 transmission.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09JZS8TM8 |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #336,629 in Automotive ( See Top 100 in Automotive ) #365 in Transmission Fluids |
| Brand | Stone River Products |
| Customer Reviews | 4.7 4.7 out of 5 stars (82) |
| Date First Available | October 21, 2021 |
| Item Weight | 16.65 pounds |
| Item model number | TES 668 & 29539579 |
| Manufacturer | ALLISON |
| Manufacturer Part Number | TES 668 & 29539579 |
| Package Dimensions | 12.64 x 12.56 x 12.24 inches |
| UPC | 698781447338 |
| Vehicle Service Type | Bus |
| Viscosity | 5W-30 sae_grade |

## Product Details

- **Brand:** Stone River Products
- **Liquid Volume:** 2 Gallons
- **Package Information:** Jug
- **Vehicle Service Type:** Bus
- **Viscosity:** 5W-30 sae_grade

## Images

![Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC 2 GALLONS and ONE Allison 29539579 Filter ONLY by DOXA Worldwide - Image 1](https://m.media-amazon.com/images/I/51Kgk+ZiQZL.jpg)
![Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC 2 GALLONS and ONE Allison 29539579 Filter ONLY by DOXA Worldwide - Image 2](https://m.media-amazon.com/images/I/61TUjVBMBnL.jpg)
![Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC 2 GALLONS and ONE Allison 29539579 Filter ONLY by DOXA Worldwide - Image 3](https://m.media-amazon.com/images/I/7195o1NNfcL.jpg)
![Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC 2 GALLONS and ONE Allison 29539579 Filter ONLY by DOXA Worldwide - Image 4](https://m.media-amazon.com/images/I/71FLM8fGZ9L.jpg)
![Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC 2 GALLONS and ONE Allison 29539579 Filter ONLY by DOXA Worldwide - Image 5](https://m.media-amazon.com/images/I/71sHxSlxnLL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Trusted
*by T***R on January 11, 2026*

Works great

### ⭐⭐⭐⭐⭐ 2002 duramax
*by S***M on April 20, 2025*

Shipment arrived very quickly no leaks on container

### ⭐⭐⭐⭐⭐ Excellent !
*by O***Y on April 6, 2025*

Great company to do business with. Quick delivery !

## Frequently Bought Together

- STONE RIVER PRODUCTS Castrol TranSynd 668 Allison 2021 Updated SPEC 2 GALLONS and ONE Allison 29539579 Filter ONLY by DOXA Worldwide
- ACDelco GM Original Equipment PF2232 Engine Oil Filter
- ACDelco GM Genuine Parts 29542833 Automatic Transmission Fluid Filter

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-01-24*