⚙️ Keep your transmission running smoother, longer—because your ride deserves the best.
Castrol TranSynd 668 is a premium full-synthetic automatic transmission fluid designed exclusively for ALLISON transmissions. It supports extended drain intervals up to 300,000 miles in general-duty use and offers superior shear stability to protect gears and clutches, ensuring enhanced durability and smooth shifting. Packaged in a convenient 5-gallon pail, it’s the go-to choice for professionals and fleet managers seeking reliable, long-lasting transmission performance.
| ASIN | B0977Q8S49 |
| Best Sellers Rank | #13,903 in Automotive ( See Top 100 in Automotive ) #56 in Transmission Fluids |
| Customer Reviews | 4.8 4.8 out of 5 stars (286) |
| Item model number | 15E2E0 |
| Manufacturer | Castrol |
| Package Dimensions | 16.2 x 12.5 x 12.5 inches; 38 Pounds |
| UPC | 079191219638 |
J**X
Excellent value
Excellent value for complete service of your Allison transmission
K**N
Liquid gold
I have a 2007 Fleetwood Discovery 40x. I wanted to service the transmission and this was the preferred fluid. Great buy delivered straight to my door
M**H
Specified oil and thus does the job well
Specified oil for the cummins transmission and thus does the job well.
T**R
A must for Allison 3000 and 4000 Transmission models
Very Good Trans Fluid. This product is recommended by Allison Automatic Transmissions. It provides excellent service life and smooth shifting. Also fluid change intervals are extended.
J**S
Expensive, but it's the best!
Pretty expensive stuff ($38/gallon), but if you have a $10,000+ transmission to protect, it's worth the money. I've used cheaper products before but they don't seem to last or perform as well (rough shifting, burnt smelling fluid after only a few thousand miles, etc.).
C**D
Fabulous Transmission Fluid
Great product that makes my Allison transmission 😉 happy!
M**H
Good product
I bought this to put in my Allison transmission. I haven't had it in long but so far it seems to be fine. It's kind of pricey but I think it's worth it
J**C
OMSI and TranSynd just go together!
Our Vactor Truck has an OMSI Transfer case that takes 11qts and needs changed out every 500 hours or 6 months this 5 gallon bucket of TranSynd makes it super convenient for us. Not to mention we've had troubles sourcing this locally! Thank you for making our maintenance easier!
Trustpilot
3 weeks ago
2 months ago
