Get The Best Price on TransSynd 668 Transmission Fluid
Released in 2004 TranSynd transmission fluid became the go to transmission fluid for all Allison heavy duty transmission applications. TranSynd was designed for extreme abuse, and the ability to perform under the harshest of situations.
TranSynd was specifically designed by Allison to be meet the highest of standards, and is sold by Castrol to meet demand.
TranSynd Features:
- Better protection
- Fully synthetic
- Improved gear protection
- Extended transmission life
- Longer oil & component life
- Extended anti-shudder durability
- Outstanding cold-flow properties
- Upgraded clutch-friction durability
- Prevents deposits & oil thickening
- Optimized frictional characteristics
- Excellent corrosion & foaming resistance
- Formulated from pure synthetic lubricants
Vehicle Applications
| YEAR | MAKE | ENGINE |
|---|---|---|
| 2001 | Chevy | 6.6L LB7 Duramax |
| 2002 | Chevy | 6.6L LB7 Duramax |
| 2003 | Chevy | 6.6L LB7 Duramax |
| 2004 | Chevy | 6.6L LB7 Duramax |
| 2004.5 | Chevy | 6.6L LLY Duramax |
| 2005 | Chevy | 6.6L LLY Duramax |
| 2006 | Chevy | 6.6L LLY/LBZ Duramax |
| 2007 | Chevy | 6.6L LLY/LBZ Duramax |
| 2007.5 | Chevy | 6.6L LMM Duramax |
| 2008 | Chevy | 6.6L LMM Duramax |
| 2009 | Chevy | 6.6L LMM Duramax |
| 2010 | Chevy | 6.6L LMM Duramax |
| 2011 | Chevy | 6.6L LML Duramax |
| 2012 | Chevy | 6.6L LML Duramax |
| 2013 | Chevy | 6.6L LML Duramax |
| 2014 | Chevy | 6.6L LML Duramax |
| 2015 | Chevy | 6.6L LML Duramax |
| 2016 | Chevy | 6.6L LML Duramax |
| 2017 | Chevy | 6.6L L5P Duramax |
| 2018 | Chevy | 6.6L L5P Duramax |
| 2019 | Chevy | 6.6L L5P Duramax |
| 2001 | GMC | 6.6L LB7 Duramax |
| 2002 | GMC | 6.6L LB7 Duramax |
| 2003 | GMC | 6.6L LB7 Duramax |
| 2004 | GMC | 6.6L LB7 Duramax |
| 2004.5 | GMC | 6.6L LLY Duramax |
| 2005 | GMC | 6.6L LLY Duramax |
| 2006 | GMC | 6.6L LLY/LBZ Duramax |
| 2007 | GMC | 6.6L LLY/LBZ Duramax |
| 2007.5 | GMC | 6.6L LMM Duramax |
| 2008 | GMC | 6.6L LMM Duramax |
| 2009 | GMC | 6.6L LMM Duramax |
| 2010 | GMC | 6.6L LMM Duramax |
| 2011 | GMC | 6.6L LML Duramax |
| 2012 | GMC | 6.6L LML Duramax |
| 2013 | GMC | 6.6L LML Duramax |
| 2014 | GMC | 6.6L LML Duramax |
| 2015 | GMC | 6.6L LML Duramax |
| 2016 | GMC | 6.6L LML Duramax |
| 2017 | GMC | 6.6L L5P Duramax |
| 2018 | GMC | 6.6L L5P Duramax |
| 2019 | GMC | 6.6L L5P Duramax |
| 2003 | Chevy Kodiak / GMC TopKick | 6.6L LB7 Duramax |
| 2004 | Chevy Kodiak / GMC TopKick | 6.6L LB7 Duramax |
| 2004.5 | Chevy Kodiak / GMC TopKick | 6.6L LLY Duramax |
| 2005 | Chevy Kodiak / GMC TopKick | 6.6L LLY Duramax |
| 2006 | Chevy Kodiak / GMC TopKick | 6.6L LLY/LBZ Duramax |
| 2007 | Chevy Kodiak / GMC TopKick | 6.6L LLY/LBZ Duramax |
| 2007.5 | Chevy Kodiak / GMC TopKick | 6.6L LMM Duramax |
| 2008 | Chevy Kodiak / GMC TopKick | 6.6L LMM Duramax |
| 2009 | Chevy Kodiak / GMC TopKick | 6.6L LMM Duramax |
| 2010 | Chevy Kodiak / GMC TopKick | 6.6L LMM Duramax |
TranSynd Transmission Fluid Questions
Is TranSynd Discontinued?
TranSynd transmission fluid is not discontinued and can still be purchased. It’s not the most common transmission fluid based on the applications it’s used in, so it’s best to get it online.
Shop for TranSynd transmission fluid here.
What Is The Best TranSynd?
In our opinion, the best TranSynd transmission fluid is Castrol. Since Castrol TranSynd is the most common version, it’s easy to get and meets all Allision specs, it’s the go to in most cases since it can be purchased in large quantities for fleet use.
The most common version of TranSynd is 668, which is backwards compatible with the older versions that include TranSynd 468, however, does not work with TranSynd 295.
What Transmission Fluid Replaced TranSynd?
TranSynd is still very common in Allison transmissions, and has been updated a couple of time since it’s inception.
What Year Did on TranSynd Come Out?
Allision TranSynd transmission fluid was introduced in late 2004 as the replacement to Dexron 3. While Dexron 3 was used in Allison applications for a long time, TranSynd is the better transmission to use long term.
- 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.
- Fit type: Universal
How Much TranSynd Do I Need?
The amount of TranSynd transmission fluid needed for your application varies, so it is best to consult your owner’s manual. In most cases, reading the transmission dipstick will give you and idea how much fluid you need when you do routine maintenance.
What Temperature Does TranSynd Fail At?
Like all transmission fluids, TranSynd is best when it’s temperature is between 160-200 degrees F. This common range is best for longevity of both your transmission fluid and transmission itself. The below transmission fluid chart shows how long transmissions last when fluid reaches various temperatures.
Can Dexron 6 Be Mixed With TranSynd?
In many cases, yes, Dexron 6 can be mixed with TranSynd. In fact, Dexron 6 is the recommended transmission fluid in GM applications with the Allison 1000.
Since TranSynd may be harder to buy, you can use Dex 6 in it’s place.
What Color Is TranSynd?
TranSynd transmission fluid is a bright red when new and should be a similar color if your transmission is maintained properly. The below transmission fluid color chart shows common transmission fluid colors depending on use and give you an idea of what to look for over time.
Can TranSynd Be Used In All Automatic Transmissions?
TranSynd is not a common transmission fluid in terms of applications and it Allison specific, so no, it cannot be used in all automatic transmissions. It’s always best to consult your vehicle’s owners manual to learn what transmission fluid is recommended for your application.
Can TranSynd Be Used As Power Steering Fluid?
Yes, it is common for transmission fluids to be used as power steering fluid. The two fluids are similar and both work in power steering systems.
However, we don’t recommend using TranSynd as a power steering fluid because it’s much better suited to be used in your transmission. TranSynd is expensive, so it’s best to not waste it.
Where Can I Get TranSynd?
The best place to get TranSynd is online. Like we’ve said, TranSynd isn’t a common transmission fluid, so it’s easiest to order online and shipped to you..
How Much Does TranSynd Cost?
Unlike Dex 6 that can be used in Allison transmissions, TranSynd is more expensive. Just to compare, a gallon of Dexron 6 may be $30, where as a gallon of TranSynd may cost anywhere from $45 – $55 depending on where you get it from.
- 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.
- Fit type: Universal
Allison transmissions deserve the highest quality fluids, that’s why the Allison approved TES668 synthetic transmission fluid was engineered. TES668 is a modern formulation with many advantages over mineral-based non-synthetic fluids.
This next generation transmission fluid is specified for Allison 1000 2000 3000 and 4000 series automatic transmissions. TES668 outperforms mineral-based fluids in several key areas such as:
- oxidative stability
- anti-wear performance
- friction modifier durability
