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1 Gallon Allison Transynd TES 668 On-Highway Full Synthetic Transmission Fluid

Pricing: $59.50

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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 backwards compatible for TES 295® applications, but is not backwards compatible for TES 468™ applications.



  • 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 temperature reduction through reduced friction leads to longer oil and component life.
  • Excellent shear stability properties help to retain full transmission performance over entire oil-drain interval.
  • 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 transmission cleanliness under all conditions permits extended oil-drain intervals and decreased servicing.



  • 2001-Current Chevrolet Silverado 2500HD/3500HD With Allison Transmission 
  • 2001-Current GMC Sierra 2500HD/3500HD With Allison Transmission



  • Backwards Compatible with Allison TES 295

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