




🛠️ Elevate your transmission game with Castrol TranSynd 668 — where durability meets precision.
Castrol TranSynd 668 Allison 2021 Updated SPEC is a premium synthetic transmission fluid designed for heavy-duty trucks and GM transmissions. It offers superior gear protection, extended clutch and anti-shudder durability, excellent corrosion and foam resistance, and outstanding thermal and oxidative stability. Compatible with a wide range of vehicles, this 1-gallon bottle delivers reliable, long-lasting performance trusted by professionals.
| ASIN | B095SZB2DK |
| Best Sellers Rank | #5,262 in Automotive ( See Top 100 in Automotive ) #20 in Transmission Fluids |
| Brand | Castrol |
| Customer Reviews | 4.9 4.9 out of 5 stars (943) |
| Date First Available | May 25, 2021 |
| Item Form | Liquid |
| Item Weight | 7.5 pounds |
| Liquid Volume | 1 Gallons |
| Manufacturer Part Number | TES 668 |
| Material | Synthetic |
| Number of Items | 1 |
| Package Dimensions | 10.83 x 8.15 x 4.37 inches |
| Package Information | Bottle |
| Recommended Uses For Product | Automotive |
| UPC | 079191219164 |
| Unit Count | 128.0 Fluid Ounces |
B**L
Great Transmission Fluid
TranSynd 668 is one of the best transmission fluids available on the market currently. Developed specifically to meet rigorous Allison specifications for heavy-duty working trucks. Also works in GM transmissions like 4L80 and 6L90 and has better performance than standard ACDelco or GM Dexron VI or III fluids. OK to mix with Dex until the next fluid change. TranSynd is considered a more versatile premium synthetic option that meets a wider range of specifications and has a higher shear resistance. It can withstand more shearing forces without breaking down, making it a better choice for applications requiring extreme durability. Been running it in all of my GM and Allison transmissions for many years. Recommended.
C**N
Great quality you can trust
This is the only transmission fluid I will use on my truck period !!
A**S
great sale
good price for the gallon
J**N
Great for the Allison
Great fluid. Chevy shifting so much better now.
J**E
"Perfect"
TranSynd 668 is perfect for your Allison Transmission
R**O
Works well
Perfect match
P**2
Better Than Expected
Did a 50,000 mile change in my 2018 Chevy 3500. After change shifts felt smoother and picked up around 1 MPG on next three tanks of fuel.
G**L
Allison 1000 fluid
Shipped and delivered quickly. Bought this for my 03 Duramax with the Allison 1000 5-speed. I heard this was the best fluid for an Allison. As of right now and the past few thousand miles it has been perfect. Time will be the true tester.
E**T
I’m giving it 5 stars because it’s fully synthetic, I’m only expecting the best, the trailer will be the test
B**Y
Everything was fine as described
K**W
My chevy is 7 years young now and I swap out the external filter yearly and change out the oil every 2 years. Never ever had a problem using this oil. And I only use Alison filters BTW
K**R
Excellent product, good delivery.
M**L
Arrived on time and as ordered. why after purchasing items that they are offered at a lower price?
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