Transynd Synthetic Fluid (6 gallons)



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 Transynd (Allison's Severe Duty) Transmission Fluid
For 2001-2019 Duramax with Allison 1000 Transmission
This TES 668 fluid is backwards compatible with TES 295 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 backwards compatible for TES 295® 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 transmission cleanliness under all conditions permits extended oil-drain intervals and decreased
  • Excellent temperature reduction through reduced friction leads to longer oil and component life.
  • Outstanding cold-flow properties enable faster oil flow to all critical components, particularly during cold starts.
  • Optimized frictional characteristics gives smoother gear changing at all ambient temperatures and load
  • Excellent shear stability properties help to retain full transmission performance over the entire oil-drain interval


Documents from Allison: BrochureCharacteristics

Customer Reviews

Based on 1 review
Got what I need and on time

Always a pleasure ordering from Dmax store, guys have what we need to keep these machines running at there best... Keep up the great work and maybe for us transporters have a bulk order shipment plan. Just a thought.